Update plugin spotless to v8 (#4992)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -104,4 +104,4 @@ kotlin = { id = "org.jetbrains.kotlin.jvm", version = "2.2.20" }
 nullaway = { id = "net.ltgt.nullaway", version = "2.3.0" }
 plantuml = { id = "io.freefair.plantuml", version = "8.14.2" }
 shadow = { id = "com.gradleup.shadow", version = "9.1.0" }
-spotless = { id = "com.diffplug.spotless", version = "7.2.1" }
+spotless = { id = "com.diffplug.spotless", version = "8.0.0" }