chore: update github actions configuration

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-03-22 04:10:17,761 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 04:10:18,576 synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #922 into master will decrease coverage by 1.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #922      +/-   ##
==========================================
- Coverage   92.88%   91.63%   -1.25%     
==========================================
  Files          19       19              
  Lines        4007     4007              
  Branches      481      409      -72     
==========================================
- Hits         3722     3672      -50     
- Misses        285      332      +47     
- Partials        0        3       +3

Impacted Files	Coverage Δ
src/auth/envDetect.ts	93.42% <0%> (-3.95%)	⬇️
src/auth/jwtclient.ts	94.13% <0%> (-1.96%)	⬇️
src/auth/oauth2client.ts	94.26% <0%> (-1.74%)	⬇️
src/auth/googleauth.ts	95.67% <0%> (-1.73%)	⬇️
src/transporters.ts	97.43% <0%> (-1.29%)	⬇️
src/auth/refreshclient.ts	98.2% <0%> (-0.6%)	⬇️

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