⬆️ Update dependency testfixtures to v11

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
testfixtures (changelog)	==10.0.0 → ==11.0.0

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Release Notes

Simplistix/testfixtures (testfixtures)

v11.0.0

Compare Source

• Moved to a uv__-based, pyproject.toml-driven project layout, with main replacing
  master as the default git branch.

  __ https://docs.astral.sh/uv/

• Move from Circle CI to Github Actions for continuous integration and releasing.

• Lots of documentation has been refreshed.

• Python versions between 3.11 and 3.14, inclusive, are now supported.

• Python versions 3.10 and earlier are no longer supported.

• :class:TempDir is now introduced as a :class:~pathlib.Path-based alternative to
  :class:TempDirectory.

• :class:TempDir and :class:TempDirectory have grown support for dumping and parsing JSON,
  YAML and TOML natively by way of the :meth:~TempDir.dump and :meth:TempDir.parse methods.

• :class:TempDir and :class:TempDirectory now have :meth:~TempDir.read_text and
  :meth:TempDir.read_bytes methods that mirror the behaviour of their :class:~pathlib.Path
  equivalents.

• :class:TempDir and :class:TempDirectory now support :class:~pathlib.Path objects anywhere
  they previously supported string and sequences of strings.

• :class:TempDir and :class:TempDirectory now have a :meth:~TempDir.clone method for
  copying existing files or directories into themselves for using during testing.

• None can now be passed to :class:ShouldRaise to check that no exception is raised.
  This is useful for parameterised tests where some cases may expect an exception to be raised
  while others do not.

• :class:ShouldRaise now has a match parameter to bring feature parity with
  :func:pytest.raises.

• :class:Comparison now shows the wrong type when it is compared against a wrong type.

• :class:Comparison no longer spuriously reports
  :class:~testfixtures.comparison.AlreadySeen as the wrong type.

• Fixed a bug where comparing parameterised generic type objects resulted in an infinite loop.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.79%. Comparing base (38fa344) to head (8cacc94).
⚠️ Report is 6 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1489   +/-   ##
=======================================
  Coverage   94.79%   94.79%           
=======================================
  Files         152      152           
  Lines        5974     5974           
  Branches      350      350           
=======================================
  Hits         5663     5663           
  Misses        249      249           
  Partials       62       62           

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[codspeed-hq]

Merging this PR will not alter performance

✅ 113 untouched benchmarks

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_{Comparing renovate/testfixtures-11.x (8cacc94) with dev (38fa344)}