chore(gradle): bump com.diffplug.spotless:spotless-plugin-gradle from…

… 6.18.0 to 6.25.0 (#6249)

Bumps [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless) from 6.18.0 to 6.25.0.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@gradle/6.18.0...gradle/6.25.0)

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

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

buildSrc/build.gradle

@@ -30,7 +30,7 @@ dependencies {
         because('needed by plugin com.avast.gradle.docker-compose')
     }
 
-    implementation('com.diffplug.spotless:spotless-plugin-gradle:6.18.0') {
+    implementation('com.diffplug.spotless:spotless-plugin-gradle:6.25.0') {
         because('needed by plugin java-coding-conventions')
     }