Update dependency pyfakefs to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
pyfakefs (changelog)	5.10.2 -> 6.0.0

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Release Notes

pytest-dev/pyfakefs (pyfakefs)

v6.0.0

Compare Source

Removes some deprecated functionality, removes support for Python < 3.10.

Breaking Changes

• removed support for Python versions < 3.10; patch releases based on pyfakefs 5.10
  supporting older versions may be made on demand
• removed support for patching legacy modules scandir and pathlib2
• changed the default for FakeFilesystem.shuffle_listdir_results to True to reflect
  the real filesystem behavior

Changes

• added some support for Python 3.15a3

Fixes

• fixes a problem with Path type hints using the pipe symbol in wrapped functions
  inside an fs dependent fixture (see #​1242)
• fixes problem with new coverage in Python 3.14 using the fake filesystem
  (see #​1245)

Documentation

• added project information to documentation pages

Infrastructure

• added CI tests for Python 3.15

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