Bump github.com/sigstore/sigstore from 1.8.4 to 1.8.7

Bumps [github.com/sigstore/sigstore](https://github.com/sigstore/sigstore) from 1.8.4 to 1.8.7.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.8.4...v1.8.7)

---
updated-dependencies:
- dependency-name: github.com/sigstore/sigstore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -10,7 +10,7 @@ require (
  github.com/containerd/containerd v1.7.20
  github.com/go-git/go-git/v5 v5.12.0
  github.com/google/go-cmp v0.6.0
- github.com/google/go-containerregistry v0.19.2
+ github.com/google/go-containerregistry v0.20.0
  github.com/google/uuid v1.6.0
  github.com/hashicorp/errwrap v1.1.0 // indirect
  github.com/hashicorp/go-multierror v1.1.1
@@ -19,14 +19,14 @@ require (
  github.com/mitchellh/go-homedir v1.1.0
  github.com/opencontainers/image-spec v1.1.0
  github.com/pkg/errors v0.9.1
- github.com/sigstore/sigstore v1.8.4
+ github.com/sigstore/sigstore v1.8.7
  github.com/spiffe/go-spiffe/v2 v2.3.0
  github.com/spiffe/spire-api-sdk v1.10.0
  github.com/tektoncd/plumbing v0.0.0-20220817140952-3da8ce01aeeb
  go.opencensus.io v0.24.0
  go.uber.org/zap v1.27.0
- golang.org/x/exp v0.0.0-20230515195305-f3d0a9c9a5cc
- golang.org/x/oauth2 v0.20.0 // indirect
+ golang.org/x/exp v0.0.0-20240112132812-db7319d0e0e3
+ golang.org/x/oauth2 v0.21.0 // indirect
  gomodules.xyz/jsonpatch/v2 v2.4.0
  k8s.io/api v0.29.6
  k8s.io/apimachinery v0.29.7
@@ -86,7 +86,7 @@ require (
  github.com/antlr4-go/antlr/v4 v4.13.0 // indirect
  github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.2 // indirect
  github.com/aws/aws-sdk-go-v2/service/kms v1.32.1 // indirect
- github.com/aws/aws-sdk-go-v2/service/ssooidc v1.24.3 // indirect
+ github.com/aws/aws-sdk-go-v2/service/ssooidc v1.24.5 // indirect
  github.com/cenkalti/backoff/v3 v3.2.2 // indirect
  github.com/cenkalti/backoff/v4 v4.3.0 // indirect
  github.com/cloudflare/circl v1.3.7 // indirect
@@ -116,7 +116,7 @@ require (
  github.com/hashicorp/vault/api v1.14.0 // indirect
  github.com/jellydator/ttlcache/v3 v3.2.0 // indirect
  github.com/kylelemons/godebug v1.1.0 // indirect
- github.com/letsencrypt/boulder v0.0.0-20230907030200-6d76a0f91e1e // indirect
+ github.com/letsencrypt/boulder v0.0.0-20240620165639-de9c06129bec // indirect
  github.com/mitchellh/mapstructure v1.5.0 // indirect
  github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
  github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f // indirect
@@ -128,14 +128,13 @@ require (
  github.com/stoewer/go-strcase v1.2.0 // indirect
  github.com/titanous/rocacheck v0.0.0-20171023193734-afe73141d399 // indirect
  github.com/zeebo/errs v1.3.0 // indirect
- go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 // indirect
- go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
+ go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.52.0 // indirect
+ go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.52.0 // indirect
  go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.27.0 // indirect
  go.opentelemetry.io/otel/metric v1.28.0 // indirect
  go.opentelemetry.io/proto/otlp v1.2.0 // indirect
  google.golang.org/genproto/googleapis/api v0.0.0-20240520151616-dc85e6b867a5 // indirect
- google.golang.org/genproto/googleapis/rpc v0.0.0-20240515191416-fc5f0ca64291 // indirect
- gopkg.in/go-jose/go-jose.v2 v2.6.3 // indirect
+ google.golang.org/genproto/googleapis/rpc v0.0.0-20240520151616-dc85e6b867a5 // indirect
 )
 
 // TODO: Remove this once github.com/google/go-containerregistry uses github.com/aws/aws-sdk-go-v2 >v1.23.0
@@ -156,18 +155,18 @@ require (
  github.com/Azure/go-autorest/autorest/date v0.3.0 // indirect
  github.com/Azure/go-autorest/logger v0.2.1 // indirect
  github.com/Azure/go-autorest/tracing v0.6.0 // indirect
- github.com/aws/aws-sdk-go-v2 v1.27.0 // indirect
- github.com/aws/aws-sdk-go-v2/config v1.27.16 // indirect
- github.com/aws/aws-sdk-go-v2/credentials v1.17.16 // indirect
- github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.3 // indirect
- github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.7 // indirect
- github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.7 // indirect
+ github.com/aws/aws-sdk-go-v2 v1.27.2 // indirect
+ github.com/aws/aws-sdk-go-v2/config v1.27.18 // indirect
+ github.com/aws/aws-sdk-go-v2/credentials v1.17.18 // indirect
+ github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.5 // indirect
+ github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.9 // indirect
+ github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.9 // indirect
  github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 // indirect
  github.com/aws/aws-sdk-go-v2/service/ecr v1.18.11 // indirect
  github.com/aws/aws-sdk-go-v2/service/ecrpublic v1.16.2 // indirect
- github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.9 // indirect
- github.com/aws/aws-sdk-go-v2/service/sso v1.20.9 // indirect
- github.com/aws/aws-sdk-go-v2/service/sts v1.28.10 // indirect
+ github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.11 // indirect
+ github.com/aws/aws-sdk-go-v2/service/sso v1.20.11 // indirect
+ github.com/aws/aws-sdk-go-v2/service/sts v1.28.12 // indirect
  github.com/aws/smithy-go v1.20.2 // indirect
  github.com/awslabs/amazon-ecr-credential-helper/ecr-login v0.0.0-20230510185313-f5e39e5f34c7 // indirect
  github.com/beorn7/perks v1.0.1 // indirect
@@ -228,15 +227,15 @@ require (
  github.com/vbatts/tar-split v0.11.3 // indirect
  go.uber.org/automaxprocs v1.5.3 // indirect
  go.uber.org/multierr v1.11.0 // indirect
- golang.org/x/crypto v0.23.0 // indirect
+ golang.org/x/crypto v0.25.0 // indirect
  golang.org/x/mod v0.17.0 // indirect
  golang.org/x/net v0.25.0 // indirect
  golang.org/x/sync v0.7.0
- golang.org/x/sys v0.20.0 // indirect
- golang.org/x/term v0.20.0 // indirect
- golang.org/x/text v0.15.0 // indirect
+ golang.org/x/sys v0.22.0 // indirect
+ golang.org/x/term v0.22.0 // indirect
+ golang.org/x/text v0.16.0 // indirect
  golang.org/x/time v0.5.0 // indirect
- golang.org/x/tools v0.20.0 // indirect
+ golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
  google.golang.org/api v0.181.0 // indirect
  google.golang.org/genproto v0.0.0-20240401170217-c3f982113cda // indirect
  google.golang.org/grpc v1.64.0