CompatHelper: bump compat for Compat to 4, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the Compat package from 2.1, 3.0 to 2.1, 3.0, 4. This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov[bot]]

Codecov Report

Merging #129 (24fe999) into master (87f4c39) will decrease coverage by 7.28%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
- Coverage   95.04%   87.75%   -7.29%     
==========================================
  Files           5        5              
  Lines         706      686      -20     
==========================================
- Hits          671      602      -69     
- Misses         35       84      +49     

Flag	Coverage Δ
Pkg.test	?
Run.test	87.75% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/macro.jl	75.78% <0.00%> (-18.09%)	:arrow_down:
src/reduce.jl	90.65% <0.00%> (-4.32%)	:arrow_down:

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[christiangnrd]

@tkf Can this be merged?

[tkf]

Sorry for the wait! Releasing https://github.com/JuliaRegistries/General/pull/69624