CompatHelper: bump compat for Symbolics to 5, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the Symbolics package from 4 to 4, 5. 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 #93 (3e5750d) into master (0a4740d) will decrease coverage by 6.57%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
- Coverage   83.71%   77.14%   -6.58%     
==========================================
  Files           4        4              
  Lines         350      350              
==========================================
- Hits          293      270      -23     
- Misses         57       80      +23     

Impacted Files	Coverage Δ
src/ReactionNetworkImporters.jl	85.71% <0.00%> (-14.29%)	:arrow_down:
src/parsing_routines_bngnetworkfiles.jl	87.76% <0.00%> (-7.98%)	:arrow_down:
src/parsing_routines_matrixnetworks.jl	90.00% <0.00%> (-6.37%)	:arrow_down:

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