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Change gogo/protobuf dependency

This was modified in:
https://github.com/cloudfoundry-incubator/garden/commit/e47f4c4ca934e46a23fd3da067308b4e72e2c5e6

[#84929300]
Restore old gogoprotobuf dependency

For some reason the acceptance tests seem to require this too.

[#84929300]
Add back old dependency properly

git submodule trouble the last time

[#84929300]
release v0.76.0