Go: Bump github.com/sethvargo/go-envconfig from 0.9.0 to 1.0.0

Bumps [github.com/sethvargo/go-envconfig](https://github.com/sethvargo/go-envconfig) from 0.9.0 to 1.0.0.
- [Release notes](https://github.com/sethvargo/go-envconfig/releases)
- [Commits](sethvargo/go-envconfig@v0.9.0...v1.0.0)

---
updated-dependencies:
- dependency-name: github.com/sethvargo/go-envconfig
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

go.mod

@@ -46,7 +46,7 @@ require (
 	github.com/sabhiram/go-gitignore v0.0.0-20210923224102-525f6e181f06
 	github.com/securego/gosec/v2 v2.18.2
 	github.com/segmentio/backo-go v1.0.1
-	github.com/sethvargo/go-envconfig v0.9.0
+	github.com/sethvargo/go-envconfig v1.0.0
 	github.com/spf13/afero v1.11.0
 	github.com/spf13/cobra v1.8.0
 	github.com/spf13/pflag v1.0.5