CompatHelper: bump compat for "WignerSymbols" to "2"

[github-actions]

This pull request changes the compat entry for the WignerSymbols package from 1 to 1, 2.

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 #309 (eef2e23) into master (2751c4c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #309   +/-   ##
=======================================
  Coverage   97.98%   97.98%           
=======================================
  Files          15       15           
  Lines        1288     1288           
=======================================
  Hits         1262     1262           
  Misses         26       26           

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