[PR #8535/7108d646 backport][3.10] Small speed up to cookiejar filter_cookies

[patchback]

This is a backport of PR #8535 as merged into master (7108d64).

What do these changes do?

Small speed up to cookiejar

Using str.format is ~16% faster than the lambda

followup to #7944 (comment). I was hoping to use join there but later realized str.format will take *args

Are there changes in behavior for the user?

no

Is it a substantial burden for the maintainers to support this?

no

benchmark

import timeit
import itertools

_FORMAT_PATH = "{0}/{1}".format

path = "lolonglonglonglonglonglongng/path/to/a/file"

print(
    timeit.timeit(
        'itertools.accumulate(path.split("/"), _FORMAT_PATH)', globals=globals()
    )
)


print(
    timeit.timeit(
        'itertools.accumulate(path.split("/"), lambda x, y: f"{x}/{y}")',
        globals=globals(),
    )
)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.50%. Comparing base (95897b1) to head (b94762b).
Report is 7 commits behind head on 3.10.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.10    #8537      +/-   ##
==========================================
- Coverage   97.54%   97.50%   -0.05%     
==========================================
  Files         108      108              
  Lines       33549    33520      -29     
  Branches     4027     4027              
==========================================
- Hits        32724    32682      -42     
- Misses        601      612      +11     
- Partials      224      226       +2     

Flag	Coverage Δ
CI-GHA	97.41% <100.00%> (-0.04%)	⬇️
OS-Linux	97.08% <100.00%> (-0.03%)	⬇️
OS-Windows	94.66% <100.00%> (-0.06%)	⬇️
OS-macOS	96.81% <100.00%> (+0.03%)	⬆️
Py-3.10.11	96.91% <100.00%> (+0.02%)	⬆️
Py-3.10.14	96.87% <100.00%> (+0.03%)	⬆️
Py-3.11.9	97.10% <100.00%> (+0.03%)	⬆️
Py-3.12.4	97.22% <100.00%> (+0.02%)	⬆️
Py-3.8.10	94.47% <100.00%> (+0.02%)	⬆️
Py-3.8.18	96.76% <100.00%> (+0.03%)	⬆️
Py-3.9.13	96.60% <100.00%> (-0.29%)	⬇️
Py-3.9.19	96.88% <100.00%> (+0.03%)	⬆️
Py-pypy7.3.16	?
VM-macos	96.81% <100.00%> (+0.03%)	⬆️
VM-ubuntu	97.08% <100.00%> (-0.03%)	⬇️
VM-windows	94.66% <100.00%> (-0.06%)	⬇️

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