chore(deps): update plugin com.diffplug.spotless to v8

renovate[bot] · web-flow · commit 2b6ca2c2d0c1 · 2025-10-02T12:38:21.000Z
diff --git a/gradle.properties b/gradle.properties
@@ -8,4 +8,4 @@ org.gradle.jvmargs=-Duser.language=ja -Duser.country=JP \
   --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
 springBootVersion=3.4.10
 springCloudVersion=2024.0.2
-spotlessVersion=7.0.4
+spotlessVersion=8.0.0
