Apply reformatting by hand and with Ruff

[akx]

This PR updates Ruff, configures the target line-length to 95 (strikes a balance between the current line lengths in the repo and readability), and formats babel/.

Some artful # fmt: skips, as well as very minor refactoring was done to keep things more readable.

Tests are unformatted in this PR to prove that there are no functional changes in the babel/ code, so as to make this easy to review.

A future PR will likely reformat tests/ similarly, and enforce formatting in CI.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.21569% with 22 lines in your changes missing coverage. Please review.

Project coverage is 92.10%. Comparing base (de44e18) to head (859ba8d). Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
babel/dates.py	68.75%	10 Missing :warning:
babel/messages/checkers.py	60.00%	2 Missing :warning:
babel/messages/frontend.py	92.85%	2 Missing :warning:
babel/core.py	91.66%	1 Missing :warning:
babel/localtime/_win32.py	0.00%	1 Missing :warning:
babel/messages/catalog.py	94.11%	1 Missing :warning:
babel/messages/extract.py	94.11%	1 Missing :warning:
babel/messages/pofile.py	92.30%	1 Missing :warning:
babel/numbers.py	96.15%	1 Missing :warning:
babel/support.py	93.75%	1 Missing :warning:
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1202      +/-   ##
==========================================
+ Coverage   91.98%   92.10%   +0.11%     
==========================================
  Files          27       27              
  Lines        4693     4685       -8     
==========================================
- Hits         4317     4315       -2     
+ Misses        376      370       -6     

Flag	Coverage Δ
macos-14-3.10	91.14% <89.21%> (+0.11%)	:arrow_up:
macos-14-3.11	91.07% <89.21%> (+0.11%)	:arrow_up:
macos-14-3.12	91.29% <89.21%> (+0.11%)	:arrow_up:
macos-14-3.13	91.29% <89.21%> (+0.11%)	:arrow_up:
macos-14-3.8	91.00% <89.21%> (+0.11%)	:arrow_up:
macos-14-3.9	91.07% <89.21%> (+0.11%)	:arrow_up:
macos-14-pypy3.10	91.14% <89.21%> (+0.11%)	:arrow_up:
ubuntu-24.04-3.10	91.16% <89.21%> (+0.11%)	:arrow_up:
ubuntu-24.04-3.11	91.09% <89.21%> (+0.11%)	:arrow_up:
ubuntu-24.04-3.12	91.31% <89.21%> (+0.11%)	:arrow_up:
ubuntu-24.04-3.13	91.31% <89.21%> (+0.11%)	:arrow_up:
ubuntu-24.04-3.8	91.02% <89.21%> (+0.11%)	:arrow_up:
ubuntu-24.04-3.9	91.09% <89.21%> (+0.11%)	:arrow_up:
ubuntu-24.04-pypy3.10	91.16% <89.21%> (+0.11%)	:arrow_up:
windows-2022-3.10	91.15% <88.72%> (+0.11%)	:arrow_up:
windows-2022-3.11	91.08% <88.72%> (+0.11%)	:arrow_up:
windows-2022-3.12	91.30% <88.72%> (+0.11%)	:arrow_up:
windows-2022-3.13	91.30% <88.72%> (+0.11%)	:arrow_up:
windows-2022-3.8	91.12% <88.72%> (+0.11%)	:arrow_up:
windows-2022-3.9	91.08% <88.72%> (+0.11%)	:arrow_up:
windows-2022-pypy3.10	91.15% <88.72%> (+0.11%)	:arrow_up:

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