Update dependency com.diffplug.spotless:spotless-plugin-gradle to v8.8.0 (#1435)

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Author: mend-for-github-com[bot]

build.gradle

@@ -63,7 +63,7 @@ buildscript {
 
     dependencies {
         classpath "org.opensearch.gradle:build-tools:${opensearch_version}"
-        classpath "com.diffplug.spotless:spotless-plugin-gradle:8.7.0"
+        classpath "com.diffplug.spotless:spotless-plugin-gradle:8.8.0"
     }
 }