Fix request matching with Vary and redirects

[JWCook]

Fixes #809, fixes #836

[codecov]

Codecov Report

Merging #835 (636e2ad) into main (7501183) will decrease coverage by 0.17%.
The diff coverage is 50.00%.

❗ Current head 636e2ad differs from pull request most recent head af235ec. Consider uploading reports for the commit af235ec to get more accurate results

@@            Coverage Diff             @@
##             main     #835      +/-   ##
==========================================
- Coverage   99.45%   99.29%   -0.17%     
==========================================
  Files          23       23              
  Lines        1826     1831       +5     
  Branches      307      308       +1     
==========================================
+ Hits         1816     1818       +2     
- Misses          5        8       +3     
  Partials        5        5              

Impacted Files	Coverage Δ
requests_cache/serializers/cattrs.py	93.90% <25.00%> (-3.54%)	⬇️
requests_cache/policy/actions.py	100.00% <100.00%> (ø)