Fix attrs compatibility issue

[JWCook]

Fixes #140

• Fix AttributeError when using a response cached with an older version of attrs
• Update dependencies and pre-commit hooks
• Update CI image and poetry versions
• Fix implicit Optional type errors with latest mypy version

[codecov]

Codecov Report

Merging #143 (b13a7e4) into main (73fbd39) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #143   +/-   ##
=======================================
  Coverage   95.22%   95.23%           
=======================================
  Files          11       11           
  Lines        1005     1007    +2     
  Branches      179      180    +1     
=======================================
+ Hits          957      959    +2     
  Misses         34       34           
  Partials       14       14           

Impacted Files	Coverage Δ
aiohttp_client_cache/cache_control.py	98.24% <ø> (ø)
aiohttp_client_cache/session.py	90.47% <ø> (ø)
aiohttp_client_cache/backends/base.py	96.57% <100.00%> (+0.03%)	⬆️
aiohttp_client_cache/backends/redis.py	98.33% <100.00%> (ø)
aiohttp_client_cache/cache_keys.py	100.00% <100.00%> (ø)
aiohttp_client_cache/response.py	95.03% <100.00%> (ø)
aiohttp_client_cache/signatures.py	76.74% <100.00%> (ø)

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