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

Author: renovate-bot

pom.xml

@@ -68,7 +68,7 @@
     <google.common-protos.version>1.17.0</google.common-protos.version>
     <google.auth.version>0.20.0</google.auth.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>
     <guava.version>28.2-android</guava.version>