Update dependency pyfakefs to v6.2.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
pyfakefs (changelog)	6.1.6 → 6.2.0

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Release Notes

pytest-dev/pyfakefs (pyfakefs)

v6.2.0

Compare Source

Changes the MRO for file wrappers.

Changes

• fake file wrappers now derive from io.TextIOBase or io.BufferedIOBase,
  so that isinstance-checks for these classes succeed
  (see #​1307
  and #​484)

Fixes

• route some pseudo-devices to the system instead of patching them; this ensures
  that os.urandom and related functions work correctly with PyPy
  (see #​1300)
• fake file seek method did not return the location in the file
  (see #​1304)
• make sure case sensitivity is correctly set for fake posix paths
  in hash(), Path.match and Path.full_match
  (see #​1308)

Infrastructure

• use newest pytest for testing in CI

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