dependabot: bump com.google.googlejavaformat:google-java-format (#596)

Bumps [com.google.googlejavaformat:google-java-format](https://github.com/google/google-java-format) from 1.19.2 to 1.21.0.
- [Release notes](https://github.com/google/google-java-format/releases)
- [Commits](google/google-java-format@v1.19.2...v1.21.0)

---
updated-dependencies:
- dependency-name: com.google.googlejavaformat:google-java-format
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
(cherry picked from commit f9a4eb9)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

build.gradle

@@ -164,7 +164,7 @@ dependencies {
     implementation group: 'com.google.guava', name: 'failureaccess', version:'1.0.2'
     javaRestTestImplementation project.sourceSets.main.runtimeClasspath
     //spotless
-    implementation('com.google.googlejavaformat:google-java-format:1.19.2') {
+    implementation('com.google.googlejavaformat:google-java-format:1.21.0') {
         exclude group: 'com.google.guava'
     }
 }