chore(deps): update dependency rules_proto to v7

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:ubuntu: Ubuntu 18.04 LTS (OpenJDK 11, gcc 7.5.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1731420454 -o bazelci.py && python3.6 bazelci.py runner --task=ubuntu1804
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:ubuntu: Ubuntu 16.04 LTS (OpenJDK 8, gcc 5.4.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1731420454 -o bazelci.py && python3.6 bazelci.py runner --task=ubuntu1604
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:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1731420454 -o bazelci.py && python3 bazelci.py runner --task=macos
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:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1731420454 -o bazelci.py && python3 bazelci.py runner --task=macos
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:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1731420454 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
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:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1731420454 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
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:windows: Windowscurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1731420454 -o bazelci.py && python.exe bazelci.py runner --task=windows
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Total Job Run Time: 2m 36s