deps: update dependency io.grpc:grpc-bom to v1.27.2

Author: renovate-bot

pom.xml

@@ -69,7 +69,7 @@
     <google.auth.version>0.20.0</google.auth.version>
     <google.http-client.version>1.34.2</google.http-client.version>
     <gax.version>1.53.1</gax.version>
-    <grpc.version>1.27.1</grpc.version>
+    <grpc.version>1.27.2</grpc.version>
     <protobuf.version>3.11.4</protobuf.version>
     <junit.version>4.13</junit.version>
     <easymock.version>3.6</easymock.version>