Update dependency com.diffplug.spotless to v8

Author: renovate[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ doma = "3.11.0"
 junit-bom = "5.13.4"
 kotlin = "2.2.20"
 gradle-plugin-publish = "2.0.0"
-spotless = "7.2.1"
+spotless = "8.0.0"
 release = "3.1.0"
 google-java-format = "1.23.0"
 java = "17"