Issue 3426: Bump protobuf version to 3.13.0. (#5228)
Issue 3426: Bump protobuf version to 3.13.0. (#5228)

Bump protobuf version to 3.13.0.
Fixes illegal reflective warnings as a result of the upgrade to Java 11.

Signed-off-by: co-jo <469b90915924b41a0d18863bf31a641db8646937@dell.com>

pravega/pravega,pravega/pravega,pravega/pravega