Update plugin spotless to v8.5.1

Author: renovate[bot]

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ ignition = "8.3.0"
 [plugins]
 kotlin = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 modl = { id = "io.ia.sdk.modl", version = "0.5.0" }
-spotless = { id = "com.diffplug.spotless", version = "8.0.0" }
+spotless = { id = "com.diffplug.spotless", version = "8.5.1" }
 
 [libraries]
 ignition-common = { group = "com.inductiveautomation.ignitionsdk", name = "ignition-common", version.ref = "ignition" }