chore(deps): Bump sigstore from 0.5.0 to 0.7.0

Bumps `sigstore` from 0.5.0 to 0.7.0.

Updates `dev.sigstore:sigstore-gradle-sign-plugin` from 0.5.0 to 0.7.0
- [Release notes](https://github.com/sigstore/sigstore-java/releases)
- [Changelog](https://github.com/sigstore/sigstore-java/blob/main/CHANGELOG.md)
- [Commits](sigstore/sigstore-java@v0.5.0...v0.7.0)

Updates `dev.sigstore.sign` from 0.5.0 to 0.7.0

---
updated-dependencies:
- dependency-name: dev.sigstore:sigstore-gradle-sign-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: dev.sigstore.sign
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

gradle/libs.versions.toml

@@ -23,7 +23,7 @@ ksp = "1.9.22-1.0.17"
 micronaut-plugins = "4.3.2"
 mysql = "8.3.0"
 nexusPublish = "1.3.0"
-sigstore = "0.5.0"
+sigstore = "0.7.0"
 spdx-sbom = "0.6.0"
 spotless = "6.25.0"
 sonar = "4.4.1.3373"