[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]

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Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #8537   +/-   ##
=======================================
  Coverage        ?   97.56%           
=======================================
  Files           ?      108           
  Lines           ?    33520           
  Branches        ?     4027           
=======================================
  Hits            ?    32704           
  Misses          ?      594           
  Partials        ?      222           

Flag	Coverage Δ
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OS-Windows	94.73% <100.00%> (?)
OS-macOS	96.81% <100.00%> (?)
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Py-3.8.10	94.47% <100.00%> (?)
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Py-3.9.13	96.91% <100.00%> (?)
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VM-windows	94.73% <100.00%> (?)

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