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 increased (+0.1%) to 88.306% when pulling 3a34103 on JuliaTagBot:master into 1025bdc on PoisotLab:master.

[codecov]

Codecov Report

Merging #92 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #92   +/-   ##
=======================================
  Coverage   89.98%   89.98%           
=======================================
  Files          16       16           
  Lines        1068     1068           
=======================================
  Hits          961      961           
  Misses        107      107

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