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]

Pull Request Test Coverage Report for Build 141

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.989%

---

Totals
Change from base Build 140:	0.0%
Covered Lines:	341
Relevant Lines:	348

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #9   +/-   ##
=======================================
  Coverage   97.64%   97.64%           
=======================================
  Files           7        7           
  Lines         425      425           
=======================================
  Hits          415      415           
  Misses         10       10

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