chore(deps): update dependency rules_proto to v7

Failed in 50s
:ubuntu: Ubuntu 18.04 LTS (OpenJDK 11, gcc 7.5.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1734400612 -o bazelci.py && python3.6 bazelci.py runner --task=ubuntu1804
Waited 2s
·
Ran in 9s
:ubuntu: Ubuntu 16.04 LTS (OpenJDK 8, gcc 5.4.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1734400612 -o bazelci.py && python3.6 bazelci.py runner --task=ubuntu1604
Waited 1s
·
Ran in 10s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1734400612 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 4s
·
Ran in 14s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1734400612 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 3s
·
Ran in 19s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1734400612 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 10s
·
Ran in 16s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1734400612 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 4s
·
Ran in 14s
:windows: Windowscurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1734400612 -o bazelci.py && python.exe bazelci.py runner --task=windows
Waited 11s
·
Ran in 9s
Total Job Run Time: 1m 37s