deps: update grpc to 1.30.0, protobuf to 3.12.2 (#1125)

* deps: update grpc to 1.29.0, protobuf to 3.12.1

* deps: update to gRPC 1.30.0 and protobuf 3.12.2

* chore: add LZFChunk to linkage checker exclusion config

dependencies.properties

@@ -23,9 +23,9 @@ version.gax_httpjson=0.73.0
 # Versions for dependencies which actual artifacts differ between Bazel and Gradle.
 # Gradle build depends on prebuilt maven artifacts, while Bazel build depends on Bazel workspaces
 # with the sources.
-version.com_google_protobuf=3.11.4
+version.com_google_protobuf=3.12.2
 version.google_java_format=1.1
-version.io_grpc=1.28.1
+version.io_grpc=1.30.0
 
 # Maven artifacts.
 # Note, the actual name of each property matters (bazel build scripts depend on it).

gax-grpc/linkage-checker-exclusion.xml

@@ -584,4 +584,12 @@
       <Class name="io.grpc.internal.ServerImpl"/>
     </Source>
   </LinkageError>
+  <LinkageError>
+    <Target>
+      <Class name="com.ning.compress.lzf.LZFChunk"/>
+    </Target>
+    <Source>
+      <Class name="io.grpc.netty.shaded.io.netty.handler.codec.compression.LzfEncoder"/>
+    </Source>
+  </LinkageError>
 </LinkageCheckerFilter>