chore: bump testfixtures from 12.2.0 to 12.3.0

[dependabot]

Bumps testfixtures from 12.2.0 to 12.3.0.

Changelog

Sourced from testfixtures's changelog.

12.3.0 (8 Jul 2026)

• Added :doc:pydantic <pydantic> support: a :func:comparer <testfixtures.pydantic.compare_basemodel> for :class:~pydantic.BaseModel is automatically registered, and the testfixtures[pydantic] extra installs a compatible version.

• Added :class:ReprComparison and :func:repr_like for asserting an object's type along with its :func:repr.

• Added :class:StrComparison and :func:str_like for asserting an object's type along with its :class:str.

• Added :func:mapping, the typed helper for :class:MappingComparison.

• :func:like now accepts a regular expression, as a string or a compiled :class:re.Pattern, returning a :class:TextComparison typed as a :class:str. :class:TextComparison can also now be built directly from a compiled :class:re.Pattern.

• :class:ShouldRaise now accepts :func:repr_like and :func:str_like matchers, so a raised exception's type and rendering can be checked without constructing the exception instance.

• Renamed :class:!StringComparison to :class:TextComparison. :class:!StringComparison remains as a deprecated alias.

• Fixed a bug where comparing two matcher instances directly, such as two :class:SequenceComparison objects, could produce a confusing diff instead of comparing them for equality.

Commits

• f4ea6f2 Prepare for 12.3.0 release
• 95071f7 Merge pull request #253 from simplistix/pydantic/human
• 1b16e39 Call out repr_like, str_like and like's regex support in comparison.rst intro
• e68435d Show the full ValidationError literal via a captured, version-corrected clone
• aeae8d4 Improve comparing.rst and exceptions.rst with pydantic examples
• 64cb127 Document ValidationError testing with ShouldRaise, repr_like and str_like
• a09ec1e Add pydantic BaseModel comparer and document pydantic support
• 80d0c0d Document current compare() behaviour with pydantic BaseModel
• 0717abe Add testfixtures.pydantic stub
• 3d411cf Merge pull request #252 from simplistix/like-variants/human
• Additional commits viewable in compare view

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