deps: update dependency com.google.protobuf:protobuf-bom to v3.11.3 (#148)

Author: renovate-bot

pom.xml

@@ -160,7 +160,7 @@
     <google.api.version>1.30.7</google.api.version>
     <google.http.version>1.34.1</google.http.version>
     <grpc.version>1.27.0</grpc.version>
-    <protobuf.version>3.11.1</protobuf.version>
+    <protobuf.version>3.11.3</protobuf.version>
     <opencensus.version>0.24.0</opencensus.version>
     <annotations-api.version>1.3.2</annotations-api.version>
     <guava.version>28.2-android</guava.version><!-- We are currently using the *-android version to support JDK7. -->