Remove the last element by popitem()

[asvetlov]

It gives O(1) amortized complexity.

The standard dict.popitem() removes the last entry also.

[codspeed-hq]

CodSpeed Performance Report

Merging #1105 will improve performances by 12.35%

_{Comparing popitem (1366040) with master (6097b60)}

Summary

⚡ 2 improvements
✅ 140 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_multidict_popitem_str[case-insensitive-c-extension-module]	79.4 µs	71 µs	+11.87%
⚡	test_multidict_popitem_str[case-sensitive-c-extension-module]	71 µs	63.2 µs	+12.35%

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.86%. Comparing base (6097b60) to head (1366040).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
multidict/_multidict_py.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1105   +/-   ##
=======================================
  Coverage   92.86%   92.86%           
=======================================
  Files          44       44           
  Lines        5088     5088           
  Branches      385      385           
=======================================
  Hits         4725     4725           
  Misses         95       95           
  Partials      268      268           

Flag	Coverage Δ
CI-GHA	92.86% <80.00%> (ø)
MyPy	86.57% <80.00%> (ø)
pytest	100.00% <ø> (ø)

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