Update spotless to v8.9.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 springBoot = "4.1.0"
 springCloud = "2025.1.2"
 junit = "6.1.2"
-spotless = "8.8.0"
+spotless = "8.9.0"
 ktlint = "1.8.0"
 jacoco = "0.8.15"
 palantirJavaFormat = "2.96.0"