chore(deps): update plugin spotless to v8

Author: renovate[bot]

gradle/libs.versions.toml

@@ -7,6 +7,6 @@ indra = { id = "net.kyori.indra", version.ref = "indra" }
 indra-checkstyle = { id = "net.kyori.indra.checkstyle", version.ref = "indra" }
 indra-git = { id = "net.kyori.indra.git", version.ref = "indra" }
 jib = { id = "com.google.cloud.tools.jib", version = "3.4.5" }
-spotless = { id = "com.diffplug.spotless", version = "7.2.1" }
+spotless = { id = "com.diffplug.spotless", version = "8.0.0" }
 spring-boot = { id = "org.springframework.boot", version = "3.5.6" }
 spring-deps = { id = "io.spring.dependency-management", version = "1.1.7" }