chore(deps): Update dependency com.diffplug.spotless:spotless-plugin-gradle to v8

Author: renovate[bot]

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ centralPublishing = { id = "dev.lukebemish.central-portal-publishing", version.r
 [versions]
 indra = "4.0.0"
 gradleErrorprone = "4.3.0"
-spotless = "7.2.1"
+spotless = "8.1.0"
 centralPublishing = "0.1.7"
 
 [libraries]