Install TagBot as a GitHub Action

[JuliaTagBot]

You're receiving this pull request because the now-deprecated Julia TagBot GitHub App is installed for this repository. This pull request installs TagBot as a GitHub Action.
If this PR does not belong in this repository for any reason, feel free to close it.

See this Discourse thread for more details and to ask questions.
Please do not comment on this pull request, because it is unlikely that I (@christopher-dG) will see it.

[codecov]

Codecov Report

Merging #151 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #151   +/-   ##
=======================================
  Coverage   91.45%   91.45%           
=======================================
  Files          40       40           
  Lines        1030     1030           
=======================================
  Hits          942      942           
  Misses         88       88

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[coveralls]

Coverage increased (+0.1%) to 91.456% when pulling 828935c on JuliaTagBot:master into 3010de6 on PoisotLab:master.