Bump com.diffplug.spotless:spotless-plugin-gradle from 7.2.0 to 7.2.1

Bumps [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless) from 7.2.0 to 7.2.1.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@gradle/7.2.0...gradle/7.2.1)

---
updated-dependencies:
- dependency-name: com.diffplug.spotless:spotless-plugin-gradle
  dependency-version: 7.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -19,7 +19,7 @@ junit-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
 maven-plugin = { module = "com.vanniktech:gradle-maven-publish-plugin", version.ref = "maven-publish" }
 nullaway = { module = "com.uber.nullaway:nullaway", version = "0.12.7" }
 protobuf-java = { module = "com.google.protobuf:protobuf-java", version.ref = "protobuf" }
-spotless = { module = "com.diffplug.spotless:spotless-plugin-gradle", version = "7.2.0" }
+spotless = { module = "com.diffplug.spotless:spotless-plugin-gradle", version = "7.2.1" }
 
 [plugins]
 errorprone = { id = "net.ltgt.errorprone", version = "4.3.0" }