[Backport 2.x] Update dependency com.diffplug.spotless:spotless-plugi…

…n-gradle to v6.25.0 (#443)

Update dependency com.diffplug.spotless:spotless-plugin-gradle to v6.25.0 (#441)



(cherry picked from commit f4a31d0)

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build.gradle

@@ -35,7 +35,7 @@ buildscript {
 
     dependencies {
         classpath "org.opensearch.gradle:build-tools:${opensearch_version}"
-        classpath "com.diffplug.spotless:spotless-plugin-gradle:6.24.0"
+        classpath "com.diffplug.spotless:spotless-plugin-gradle:6.25.0"
         classpath "com.github.form-com.diff-coverage-gradle:diff-coverage:0.9.5"
     }
 }