CompatHelper: add new compat entry for Symbolics at version 4, (keep existing compat)

[github-actions[bot]]

This pull request sets the compat entry for the Symbolics package to 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. Note: Consider registering a new release of your package immediately after merging this PR, as downstream packages may depend on this for tests to pass.

[codecov[bot]]

Codecov Report

Merging #71 (d5e94fd) into master (930c0fc) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   98.76%   98.76%           
=======================================
  Files          18       18           
  Lines         569      569           
=======================================
  Hits          562      562           
  Misses          7        7           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.