Bump appengine-maven-plugin from 1.9.80 to 1.9.84#4

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dependabot/maven/com.google.appengine-appengine-maven-plugin-1.9.84UltimaPhoenix/lucene-appengine-examples:dependabot/maven/com.google.appengine-appengine-maven-plugin-1.9.84Copy head branch name to clipboard