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

[github-actions]

This pull request changes the compat entry for the Compat package from 3.14 to 3.14, 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]

Codecov Report

Merging #170 (e6c4570) into master (1699f6b) will decrease coverage by 0.96%.
The diff coverage is n/a.

❗ Current head e6c4570 differs from pull request most recent head 3777abb. Consider uploading reports for the commit 3777abb to get more accurate results

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
- Coverage   29.89%   28.92%   -0.97%     
==========================================
  Files          15       15              
  Lines         562      560       -2     
==========================================
- Hits          168      162       -6     
- Misses        394      398       +4     

Impacted Files	Coverage Δ
src/Inputs/PWscf/input.jl	70.83% <0.00%> (-8.34%)	⬇️
src/Inputs/PWscf/namelists.jl	81.25% <0.00%> (-1.79%)	⬇️
src/Inputs/PWscf/cards.jl	52.63% <0.00%> (-1.61%)	⬇️

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