Update dependency com.diffplug.spotless to v8

Author: renovate-bot

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ kotlin = "2.0.21"
 ktlint-cli = "1.4.0"
 kotlinx-io = "0.5.4"
 maven-publish = "0.30.0"
-spotless = "6.25.0"
+spotless = "8.0.0"
 
 [libraries]
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }