Bump cloud.google.com/go/security from 1.15.2 to 1.15.3

Bumps [cloud.google.com/go/security](https://github.com/googleapis/google-cloud-go) from 1.15.2 to 1.15.3.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/main/CHANGES.md)
- [Commits](googleapis/google-cloud-go@kms/v1.15.2...kms/v1.15.3)

---
updated-dependencies:
- dependency-name: cloud.google.com/go/security
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -3,7 +3,7 @@ module github.com/sigstore/timestamp-authority
 go 1.21
 
 require (
-	cloud.google.com/go/security v1.15.2
+	cloud.google.com/go/security v1.15.3
 	github.com/beevik/ntp v1.3.0
 	github.com/digitorus/pkcs7 v0.0.0-20230818184609-3a137a874352
 	github.com/digitorus/timestamp v0.0.0-20230902153158-687734543647
@@ -149,7 +149,7 @@ require (
 	google.golang.org/genproto v0.0.0-20231002182017-d307bd883b97 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20231002182017-d307bd883b97 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20231009173412-8bfb1ae86b6c // indirect
-	google.golang.org/grpc v1.58.3 // indirect
+	google.golang.org/grpc v1.59.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/square/go-jose.v2 v2.6.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect

go.sum

@@ -41,8 +41,8 @@ cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2k
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
 cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
 cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
-cloud.google.com/go/security v1.15.2 h1:VNpdJNfMeHSJZ+647QtzPrvZ6rWChBklLm/NY64RVW8=
-cloud.google.com/go/security v1.15.2/go.mod h1:2GVE/v1oixIRHDaClVbHuPcZwAqFM28mXuAKCfMgYIg=
+cloud.google.com/go/security v1.15.3 h1:RXYyXEtudhyqqNZNzVZWuDW5BkSCfqo2OOgOKcxg1Ho=
+cloud.google.com/go/security v1.15.3/go.mod h1:gQ/7Q2JYUZZgOzqKtw9McShH+MjNvtDpL40J1cT+vBs=
 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
 cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
@@ -908,8 +908,8 @@ google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM
 google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
 google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
 google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.58.3 h1:BjnpXut1btbtgN/6sp+brB2Kbm2LjNXnidYujAVbSoQ=
-google.golang.org/grpc v1.58.3/go.mod h1:tgX3ZQDlNJGU96V6yHh1T/JeoBQ2TXdr43YbYSsCJk0=
+google.golang.org/grpc v1.59.0 h1:Z5Iec2pjwb+LEOqzpB2MR12/eKFhDPhuqW91O+4bwUk=
+google.golang.org/grpc v1.59.0/go.mod h1:aUPDwccQo6OTjy7Hct4AfBPD1GptF4fyUjIkQ9YtF98=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=