Update gogo/prototbuf and nghttp2 dependencies (#4761)
Update gogo/prototbuf and nghttp2 dependencies (#4761)

Update dependencies - gogo/prototbuf 1.1.1 (release notes) & nghttp2 1.34.0 (release notes). nghttp2 update implements Implement RFC 8441 which should enable H2 with websockets

Risk Level: Medium
Testing: bazel test //test/... and running on local instances
Docs Changes: none required
Release Notes: none required

Signed-off-by: Michael Payne <michael@sooper.org>

Mirrored from https://github.com/envoyproxy/envoy @ 38ccd02d5d57dd233940d1040083c9bc1eed76f4

lyft/envoy-api,lyft/envoy-api,lyft/envoy-api