Merge pull request #428 from yuzawa-san/dependabot/gradle/com.diffplug.spotless-8.7.0

Bump com.diffplug.spotless from 8.6.0 to 8.7.0

Author: yuzawa-san

build.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id "com.diffplug.spotless" version "8.6.0"
+	id "com.diffplug.spotless" version "8.7.0"
 	id 'java'
 	id 'maven-publish'
 	id 'signing'