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.

[coveralls]

Coverage remained the same at 97.561% when pulling f31b22d on JuliaTagBot:master into ccd134c on tpapp:master.

[codecov]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #3   +/-   ##
=======================================
  Coverage   97.56%   97.56%           
=======================================
  Files           1        1           
  Lines         123      123           
=======================================
  Hits          120      120           
  Misses          3        3

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