Use timestamp instead of datetime to achieve faster cookie expiration…

[Dreamsorcerer]

(cherry picked from commit 8ae650b)

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (cb94533) 97.35% compared to head (a1ad723) 97.35%.
Report is 3 commits behind head on 3.9.

Files	Patch %	Lines
aiohttp/cookiejar.py	88.00%	2 Missing and 1 partial ⚠️
aiohttp/resolver.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              3.9    #7837      +/-   ##
==========================================
- Coverage   97.35%   97.35%   -0.01%     
==========================================
  Files         107      107              
  Lines       32357    32357              
  Branches     3836     3838       +2     
==========================================
- Hits        31501    31500       -1     
  Misses        652      652              
- Partials      204      205       +1     

Flag	Coverage Δ
CI-GHA	97.26% <91.11%> (-0.01%)	⬇️
OS-Linux	96.95% <88.88%> (-0.01%)	⬇️
OS-Windows	94.49% <91.11%> (-0.01%)	⬇️
OS-macOS	96.61% <88.88%> (-0.01%)	⬇️
Py-3.10.11	94.40% <91.11%> (-0.01%)	⬇️
Py-3.10.13	96.78% <88.88%> (-0.01%)	⬇️
Py-3.11.6	96.45% <88.88%> (-0.01%)	⬇️
Py-3.12.0	96.50% <88.88%> (?)
Py-3.8.10	94.37% <91.11%> (-0.01%)	⬇️
Py-3.8.18	96.71% <88.88%> (-0.01%)	⬇️
Py-3.9.13	94.38% <91.11%> (-0.01%)	⬇️
Py-3.9.18	96.76% <88.88%> (-0.01%)	⬇️
Py-pypy7.3.13	96.21% <88.88%> (-0.01%)	⬇️
VM-macos	96.61% <88.88%> (-0.01%)	⬇️
VM-ubuntu	96.95% <88.88%> (-0.01%)	⬇️
VM-windows	94.49% <91.11%> (-0.01%)	⬇️

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