Bumps the gomod group with 3 updates in the / directory: [github.com/sigstore/sigstore](https://github.com/sigstore/sigstore), [github.com/sigstore/sigstore/pkg/signature/kms/azure](https://github.com/sigstore/sigstore) and [github.com/sigstore/sigstore/pkg/signature/kms/gcp](https://github.com/sigstore/sigstore).


Updates `github.com/sigstore/sigstore` from 1.8.4 to 1.8.6
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.8.4...v1.8.6)

Updates `github.com/sigstore/sigstore/pkg/signature/kms/azure` from 1.8.4 to 1.8.6
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.8.4...v1.8.6)

Updates `github.com/sigstore/sigstore/pkg/signature/kms/gcp` from 1.8.4 to 1.8.6
- [Release notes](https://github.com/sigstore/sigstore/releases)
- [Commits](sigstore/sigstore@v1.8.4...v1.8.6)

Updates `golang.org/x/exp` from 0.0.0-20231108232855-2478ac86f678 to 0.0.0-20240112132812-db7319d0e0e3
- [Commits](https://github.com/golang/exp/commits)

---
updated-dependencies:
- dependency-name: github.com/sigstore/sigstore
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gomod
- dependency-name: github.com/sigstore/sigstore/pkg/signature/kms/azure
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gomod
- dependency-name: github.com/sigstore/sigstore/pkg/signature/kms/gcp
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gomod
- dependency-name: golang.org/x/exp
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gomod
...

Signed-off-by: dependabot[bot] <[email protected]>

This doesn't seem to useful to a human but apparently makes computer happy.

Signed-off-by: Jussi Kukkonen <[email protected]>