chore(deps): update dependency com.google.protobuf:protobuf-java to v…

…3.10.0 (googleapis#13)

pom.xml

@@ -156,7 +156,7 @@
     <google.common-protos.version>1.16.0</google.common-protos.version>
     <gax.version>1.48.1</gax.version>
     <grpc.version>1.23.0</grpc.version>
-    <protobuf.version>3.9.1</protobuf.version>
+    <protobuf.version>3.10.0</protobuf.version>
     <junit.version>4.12</junit.version>
     <guava.version>28.0-android</guava.version>
     <threeten.version>1.4.0</threeten.version>