chore: implement initial support for CPython 3.14

[vytas7]

This PR implements rudimentary support for CPython 3.14, adapting our monkey-patching of Morsel attributes to a new optimization in 3.14 stdlib.
In addition, the monkey patching of the SameSite attribute was removed, since it is no longer needed on 3.8+.

(See also Red Hat Bugzilla: Bug 2328020. @befeleme @carlwgeorge)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (66eb886) to head (e18a498).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2412   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           64        64           
  Lines         7726      7727    +1     
  Branches      1071      1071           
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+ Hits          7726      7727    +1     

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[carlwgeorge]

Thanks for mentioning this @vytas7! I've included this commit as a patch in the Fedora package, and it's been built as python-falcon-4.0.2-2.fc42.