chore: update github actions configuration

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-03-22 04:09:21,101 synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
.eslintignore
.eslintrc.yml
.github/ISSUE_TEMPLATE/bug_report.md
.github/ISSUE_TEMPLATE/feature_request.md
.github/ISSUE_TEMPLATE/support_request.md
.github/PULL_REQUEST_TEMPLATE.md
.github/publish.yml
.github/release-please.yml
.github/workflows/ci.yaml
.kokoro/common.cfg
.kokoro/continuous/node10/common.cfg
.kokoro/continuous/node10/docs.cfg
.kokoro/continuous/node10/lint.cfg
.kokoro/continuous/node10/samples-test.cfg
.kokoro/continuous/node10/system-test.cfg
.kokoro/continuous/node10/test.cfg
.kokoro/continuous/node12/common.cfg
.kokoro/continuous/node12/test.cfg
.kokoro/continuous/node8/common.cfg
.kokoro/continuous/node8/test.cfg
.kokoro/docs.sh
.kokoro/lint.sh
.kokoro/presubmit/node10/common.cfg
.kokoro/presubmit/node10/docs.cfg
.kokoro/presubmit/node10/lint.cfg
.kokoro/presubmit/node10/samples-test.cfg
.kokoro/presubmit/node10/system-test.cfg
.kokoro/presubmit/node10/test.cfg
.kokoro/presubmit/node12/common.cfg
.kokoro/presubmit/node12/test.cfg
.kokoro/presubmit/node8/common.cfg
.kokoro/presubmit/node8/test.cfg
.kokoro/presubmit/windows/common.cfg
.kokoro/presubmit/windows/test.cfg
.kokoro/publish.sh
.kokoro/release/docs.cfg
.kokoro/release/docs.sh
.kokoro/release/publish.cfg
.kokoro/samples-test.sh
.kokoro/system-test.sh
.kokoro/test.bat
.kokoro/test.sh
.kokoro/trampoline.sh
.mocharc.js
.nycrc
.prettierignore
.prettierrc
CODE_OF_CONDUCT.md
CONTRIBUTING.md
LICENSE
README.md
codecov.yaml
renovate.json
samples/README.md
2020-03-22 04:09:21,888 synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #753 into master will decrease coverage by 0.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #753      +/-   ##
==========================================
- Coverage    89.3%   88.97%   -0.34%     
==========================================
  Files          45       45              
  Lines        7492     7492              
  Branches      481      462      -19     
==========================================
- Hits         6691     6666      -25     
- Misses        798      823      +25     
  Partials        3        3

Impacted Files	Coverage Δ
src/paginationCalls/pageDescriptor.ts	78.5% <0%> (-4.68%)	⬇️
src/fallback.ts	73.68% <0%> (-2.88%)	⬇️
src/streamingCalls/streamingApiCaller.ts	89.24% <0%> (-1.08%)	⬇️
src/grpc.ts	89.26% <0%> (-0.57%)	⬇️

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