Bump com.diffplug.spotless:spotless-plugin-gradle from 7.0.3 to 8.1.0

Bumps [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless) from 7.0.3 to 8.1.0.
- [Release notes](https://github.com/diffplug/spotless/releases)
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@gradle/7.0.3...gradle/8.1.0)

---
updated-dependencies:
- dependency-name: com.diffplug.spotless:spotless-plugin-gradle
  dependency-version: 8.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

build.gradle

@@ -13,7 +13,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.+'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
-        classpath 'com.diffplug.spotless:spotless-plugin-gradle:7.0.3'
+        classpath 'com.diffplug.spotless:spotless-plugin-gradle:8.1.0'
     }
 }