Add http.coookies monkeypatch (SYN-8465)

[vEpiphyte]

Vendor the fixes from CPython for GHSA-7pwv-g7hj-39pr and applies them at import time of synapse.common.

python/cpython#123067
python/cpython#123075

[codecov]

Codecov Report

Attention: Patch coverage is 75.60976% with 10 lines in your changes missing coverage. Please review.

Project coverage is 96.37%. Comparing base (6694736) to head (d2af0cf).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
synapse/vendor/cpython/lib/http/cookies.py	30.76%	9 Missing ⚠️
synapse/common.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4045      +/-   ##
==========================================
- Coverage   96.47%   96.37%   -0.10%     
==========================================
  Files         254      256       +2     
  Lines       59604    59645      +41     
==========================================
- Hits        57500    57485      -15     
- Misses       2104     2160      +56     

Flag	Coverage Δ
linux	96.37% <75.60%> (-0.03%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.