v7.21.0 release (#23330) #234

Job	Run time
Build Java Server (samples/server/petstore/java-inflector/)	1m 2s
Build Java Server (samples/server/petstore/java-pkmst/)	1m 3s
Build Java Server (samples/server/petstore/java-vertx-web/)	54s
Build Java Server (samples/server/petstore/java-microprofile/)	39s
	3m 38s

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