Bump com.diffplug.spotless:spotless-plugin-gradle (#130)

Bumps [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless) from 7.0.0.BETA4 to 7.0.0.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@gradle/7.0.0.BETA4...gradle/7.0.0)

---
updated-dependencies:
- dependency-name: com.diffplug.spotless:spotless-plugin-gradle
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -8,5 +8,5 @@ nullaway            = { module = "com.uber.nullaway:nullaway", version = "0.12.2
 
 sonarPlugin         = { module = "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin", version = "6.0.1.5171" }
 
-spotlessPlugin      = { module = "com.diffplug.spotless:spotless-plugin-gradle", version = "7.0.0.BETA4" }
+spotlessPlugin      = { module = "com.diffplug.spotless:spotless-plugin-gradle", version = "7.0.0" }