TST: astropy 5.0rc2

[pllim]

Description

This pull request is to test against astropy 5.0rc2

[github-actions]

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[codecov]

Codecov Report

Merging #322 (6066a79) into master (965680c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #322   +/-   ##
=======================================
  Coverage   94.31%   94.31%           
=======================================
  Files          14       14           
  Lines        2005     2005           
=======================================
  Hits         1891     1891           
  Misses        114      114           

Impacted Files	Coverage Δ
synphot/models.py	84.81% <0.00%> (ø)

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