Update testfixtures requirement from ^7.0.0 to ^8.0.0

[dependabot]

Updates the requirements on testfixtures to permit the latest version.

Changelog

Sourced from testfixtures's changelog.

8.0.0 (16 Feb 2024)

• Retire zope.component helpers.

• Support :class:bytes in :class:popen.MockPopen commands.

• Allow :class:TempDirectory instances to be traversed as :class:~pathlib.Path objects.

• Use the system default encoding where possible in :class:TempDirectory.

• Add :class:TempDirectory option to manage current working directory.

• Allow string class attributes to be replaced with :class:Replacer and friends.

• Fix nasty bug meaning some :meth:~Replacer.on_class and :meth:~Replacer.in_module replacements weren't restored.

• Allow an alternative separator to be used for traversal during replacement with :class:Replacer and friends.

• Officially support Python 3.12.

• Drop support Python 3.6.

7.2.2 (20 Oct 2023)

• Fix bug in support for :class:os.PathLike arguments to :class:popen.MockPopen.

7.2.1 (20 Oct 2023)

• Added missing support for :class:os.PathLike arguments to :class:popen.MockPopen.

7.2.0 (15 Sep 2023)

• Add order_matters parameter to :class:ShouldWarn.

Thanks to Jan Musílek for the implementation!

7.1.0 (8 Feb 2023)

• Implement new IDE and static-analysis ways of :doc:mocking <mocking> including additional parameters to :meth:~Replacer.replace along with the :any:replace_on_class, :any:replace_in_module and :any:replace_in_environ context managers.

... (truncated)

Commits

• f8d7eb3 Repare for 8.0.0 release
• d1ab2f3 Allow an alternative separator to be used for traversal during replacement
• 920ba0a Better error message when traversal fails
• 7fcbc3d General tidy up of mocking docs
• 0d8fcd5 Fix nasty bug meaning some on_class and in_module replacements weren't restored
• 61606b5 Allow string class attributes to be replaced
• cdfce9b Fix ReST typo
• 2163a5a Add TempDirectory option to manage current working directory
• 757fda5 General TempDirectory documentation improvements
• ba1175e Use system default encoding where possible in TempDirectory
• Additional commits viewable in compare view

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