Update plugin spotless to v8.1.0 (#723)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -25,7 +25,7 @@ intelliJ = ["intellijCoreImpl", "intellijProjectModelImpl", "intellijAnalysisImp
 [plugins]
 kotlinJvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 grammarKitComposer = { id = "app.cash.grammarkit-composer", version = "0.2.0" }
-spotless = { id = "com.diffplug.spotless", version = "8.0.0" }
+spotless = { id = "com.diffplug.spotless", version = "8.1.0" }
 mavenPublish = { id = "com.vanniktech.maven.publish", version = "0.35.0" }
 dokka = { id = "org.jetbrains.dokka", version = "2.1.0" }
 intellij = { id = "org.jetbrains.intellij.platform", version = "2.10.4" }