Update dependency pyfakefs to v5.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pyfakefs (changelog)	5.9.0 -> 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)

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