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 96.308% when pulling 25f9fc1 on JuliaTagBot:master into bcb8090 on JuliaSmoothOptimizers:master.

[codecov]

Codecov Report

Merging #137 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #137   +/-   ##
======================================
  Coverage    96.3%   96.3%           
======================================
  Files          14      14           
  Lines         623     623           
======================================
  Hits          600     600           
  Misses         23      23

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