Update dependency com.diffplug.spotless:spotless-plugin-gradle to v8.2.1 (#172)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [libraries]
 androidPlugin = "com.android.tools.build:gradle:9.0.0"
 gradleMavenPublishPlugin = "com.vanniktech:gradle-maven-publish-plugin:0.36.0"
-spotlessPlugin = "com.diffplug.spotless:spotless-plugin-gradle:8.2.0"
+spotlessPlugin = "com.diffplug.spotless:spotless-plugin-gradle:8.2.1"
 
 googleJavaFormat = "com.google.googlejavaformat:google-java-format:1.33.0"