chore(deps): update dependency pyfakefs to v5.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pyfakefs (changelog)	==5.8.0 -> ==5.9.1

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Release Notes

pytest-dev/pyfakefs (pyfakefs)

v5.9.1

Compare Source

Fixes regression in packaging in version 5.9.0.

Fixes

• fixed handling of added strict argument in Python 3.9.23
• make sure test files are packaged (see #​1186)

v5.9.0

Compare Source

Adds support for an API change in latest Python patch releases.

Changes

• the message from an OSError raised in the fake filesystem has no longer the postfix
  "in the fake filesystem" (see #​1159)
• changed implementation of FakeShutilModule to prepare it for usage without the patcher
  (see #​1171)

Enhancements

• added convenience function add_package_metadata to add the metadata of a given
  package to the fake filesystem (see #​1155)

Fixes

• fixed handling of dynamic imports from code in the fake filesystem in Python > 3.11
  (see #​1121)
• fixed workaround for recursion with pytest under Windows to ignore capitalization
  of pytest executable (see #​1096)
• added missing mode property to fake file wrapper (see #​1162)
• fixed instantiation of a standalone FakePathlibModule for Python >= 3.11
  (see #​1169)
• added support for new value "ALLOW_MISSING" of strict argument in os.path.realpath
  (introduced in latest patch version of Python >= 3.10, see #​1180)

Infrastructure

• adapt test for increased default buffer size in Python 3.14a6
• replace session-scoped with module-scoped fixture in test,
  run pytest over all tests in docker containers
  (see #​1151)
• remove setup.py and setup.cfg in favor of pyproject.toml

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