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 480

• 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 62.544%

---

Totals
Change from base Build 478:	0.0%
Covered Lines:	354
Relevant Lines:	566

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💛 - Coveralls

[codecov]

Codecov Report

Merging #118 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #118   +/-   ##
=======================================
  Coverage   66.87%   66.87%           
=======================================
  Files          15       15           
  Lines         643      643           
=======================================
  Hits          430      430           
  Misses        213      213           

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