CompatHelper: bump compat for Catalyst to 13, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the Catalyst package from 12 to 12, 13. 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 #110 (74258de) into main (c35cd9e) will decrease coverage by 5.77%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
- Coverage   94.23%   88.47%   -5.77%     
==========================================
  Files           6        6              
  Lines         295      295              
==========================================
- Hits          278      261      -17     
- Misses         17       34      +17     

Impacted Files	Coverage Δ
src/systems.jl	83.33% <0.00%> (-8.98%)	:arrow_down:
src/events.jl	88.46% <0.00%> (-7.70%)	:arrow_down:
src/utils.jl	88.88% <0.00%> (-5.56%)	:arrow_down:
src/reactions.jl	94.33% <0.00%> (-4.72%)	:arrow_down:
src/rules.jl	92.68% <0.00%> (-2.44%)	:arrow_down:

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