chore(deps): update rules_android_ndk digest to cb776db

Failed in 8s
:pipeline:
:pipeline:curl -sS "https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?$(date +%s)" -o bazelci.py && python3.6 bazelci.py project_pipeline --file_config=.bazelci/presubmit.yml | tee /dev/tty | buildkite-agent pipeline upload
Waited 3m 47s
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Ran in 7s
Total Job Run Time: 7s