Update dependency com.google.appengine:appengine-maven-plugin to v1.9.79
Update dependency com.google.appengine:appengine-maven-plugin to v1.9.79

GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples