CompatHelper: bump compat for Polynomials to 2, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Polynomials 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 #2 (98e358c) into master (105af1e) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          130       130           
=========================================
  Hits           130       130           

Impacted Files	Coverage Δ
src/gauss_legendre.jl	100.00% <0.00%> (ø)
src/lobatto_legendre.jl	100.00% <0.00%> (ø)

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