MNT: Bump required deps, update workflows

[pllim]

Description

This pull request is to go with spacetelescope/stsynphot_refactor#167

[codecov]

Codecov Report

Base: 94.46% // Head: 97.08% // Increases project coverage by +2.61% 🎉

Coverage data is based on head (b4fd152) compared to base (cb3ff4b).
Patch coverage: 91.30% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
+ Coverage   94.46%   97.08%   +2.61%     
==========================================
  Files          17       17              
  Lines        2096     2024      -72     
==========================================
- Hits         1980     1965      -15     
+ Misses        116       59      -57     

Impacted Files	Coverage Δ
synphot/compat.py	88.23% <85.71%> (+8.23%)	⬆️
synphot/filter_parameterization/filter_fft.py	98.27% <100.00%> (+1.55%)	⬆️
synphot/models.py	95.75% <100.00%> (+10.94%)	⬆️
synphot/spectrum.py	99.49% <100.00%> (+0.16%)	⬆️
synphot/units.py	97.54% <100.00%> (+5.81%)	⬆️
synphot/utils.py	99.00% <0.00%> (+1.00%)	⬆️

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