chore: update dependency com.diffplug.spotless to v8

Author: renovate[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@
 protobuf = "0.9.5"
 springBoot = "3.5.4"
 downloadTask = "5.6.0"
-spotless = "7.2.1"
+spotless = "8.0.0"
 checkstyleTools = "10.26.1"
 springDependencyManagement = "1.1.7"