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

Bumps [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless) from 6.13.0 to 6.25.0.
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@plugin-gradle/6.13.0...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]>

build.gradle

@@ -7,7 +7,7 @@ buildscript {
         maven { url "https://plugins.gradle.org/m2/" }
         mavenCentral()
     }
-    dependencies { classpath "com.diffplug.spotless:spotless-plugin-gradle:6.13.0" }
+    dependencies { classpath "com.diffplug.spotless:spotless-plugin-gradle:6.25.0" }
 }
 
 class VersionString implements Comparable<VersionString> {