protobuf 3.19.2 (#2260)

Author: suztomo

boms/cloud-oss-bom/pom.xml

@@ -52,7 +52,7 @@
     <google.cloud.core.version>2.3.3</google.cloud.core.version>
     <io.grpc.version>1.42.1</io.grpc.version>
     <http.version>1.40.1</http.version>
-    <protobuf.version>3.19.1</protobuf.version>
+    <protobuf.version>3.19.2</protobuf.version>
     <!-- We don't use gax-bom because it includes the artifacts with 'testlib' classifier.
         When updating gax.version, update gax.httpjson.version too. -->
     <gax.version>2.7.1</gax.version>