CompatHelper: bump compat for BoundaryValueDiffEq to 4 for package downstream, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the BoundaryValueDiffEq package from 2.10, 3 to 2.10, 3, 4 for package downstream. 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 #484 (e882471) into master (6ccbe09) will increase coverage by 4.89%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #484      +/-   ##
==========================================
+ Coverage   52.07%   56.97%   +4.89%     
==========================================
  Files          50       50              
  Lines        3658     3658              
==========================================
+ Hits         1905     2084     +179     
+ Misses       1753     1574     -179     

see 14 files with indirect coverage changes

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