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 (+0.2%) to 92.361% when pulling 0a0f68f on JuliaTagBot:master into c4029ce on JuliaGraphics:master.

[codecov]

Codecov Report

Merging #315 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #315      +/-   ##
==========================================
- Coverage   92.12%   92.07%   -0.06%     
==========================================
  Files           1        1              
  Lines         432      454      +22     
==========================================
+ Hits          398      418      +20     
- Misses         34       36       +2     

Impacted Files	Coverage Δ
src/Cairo.jl	92.07% <0.00%> (-0.06%)	⬇️

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