Update plugin com.diffplug.spotless to v8

Author: renovate[bot]

buildSrc/src/main/java/Versions.kt

@@ -13,7 +13,7 @@ object Versions {
     const val navigation = "2.7.0"
     const val secretPlugin = "2.0.1"
     const val benManes = "0.52.0"
-    const val spotlessVersion = "6.25.0"
+    const val spotlessVersion = "8.2.1"
     const val ktLintVersion = "13.0.0"
     const val googleServices = "4.3.15"