feat(deps): bump github.com/sigstore/sigstore/pkg/signature/kms/gcp

Bumps [github.com/sigstore/sigstore/pkg/signature/kms/gcp](https://github.com/sigstore/sigstore) from 1.8.9 to 1.8.10.
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](https://github.com/sigstore/sigstore/compare/v1.8.9...v1.8.10)

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

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

go.sum

@@ -537,8 +537,8 @@ github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.9 h1:tgpdvjyoEgYFeTBFe4M
 github.com/sigstore/sigstore/pkg/signature/kms/aws v1.8.9/go.mod h1:wCz6cAZKL/wFumDHX9l8VkVITS2GntrOfs2j/kwH4wo=
 github.com/sigstore/sigstore/pkg/signature/kms/azure v1.8.8 h1:RKk4Z+qMaLORUdT7zntwMqKiYAej1VQlCswg0S7xNSY=
 github.com/sigstore/sigstore/pkg/signature/kms/azure v1.8.8/go.mod h1:dMJdlBWKHMu2xf0wIKpbo7+QfG+RzVkBB3nHP8EMM5o=
-github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.9 h1:liWcl12dfFeQXU0JemQVgdVQx02Fls9UPdrFzVrCWhs=
-github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.9/go.mod h1:Ckx62auqPQvNJWRBAboY+/kHs77gy6L33b6UtB/FB5U=
+github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.10 h1:Xre51HdjIIaVo5ox5zyL+6h0tkrx7Ke9Neh7fLmmZK0=
+github.com/sigstore/sigstore/pkg/signature/kms/gcp v1.8.10/go.mod h1:VNfdklQDbyGJog8S7apdxiEfmYmCkKyxrsCL9xprkTY=
 github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.8.8 h1:Zte3Oogkd8m+nu2oK3yHtGmN++TZWh2Lm6q2iSprT1M=
 github.com/sigstore/sigstore/pkg/signature/kms/hashivault v1.8.8/go.mod h1:j00crVw6ki4/WViXflw0zWgNALrAzZT+GbIK8v7Xlz4=
 github.com/sigstore/timestamp-authority v1.2.2 h1:X4qyutnCQqJ0apMewFyx+3t7Tws00JQ/JonBiu3QvLE=