Update plugin spotless to v7

Author: renovate[bot]

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ jackson = "2.19.0"
 kotlin = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 conveyor = { id = "dev.hydraulic.conveyor", version = "1.12" }
-spotless = { id = "com.diffplug.spotless", version = "6.25.0" }
+spotless = { id = "com.diffplug.spotless", version = "7.0.3" }
 dokka = { id = "org.jetbrains.dokka", version = "2.0.0" }
 
 [libraries]