CompatHelper: bump compat for "SpecialFunctions" to "1.2"

[github-actions]

This pull request changes the compat entry for the SpecialFunctions package from 0.7, 0.8, 0.9, 0.10 to 0.7, 0.8, 0.9, 0.10, 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-io]

Codecov Report

Merging #24 (e04af66) into master (1e872c7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #24   +/-   ##
=======================================
  Coverage   82.50%   82.50%           
=======================================
  Files           5        5           
  Lines         160      160           
=======================================
  Hits          132      132           
  Misses         28       28           

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