Update dependency pyfakefs to v6.1.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
pyfakefs (changelog)	6.0.0 → 6.1.0

---

Release Notes

pytest-dev/pyfakefs (pyfakefs)

v6.1.0

Compare Source

Changes back-link references to weak references.

Changes

• added more support for PyPy 3
• Caution: many back-link references have been replaced by weak references;
  this may have unwanted consequences (crashes) for some untested workflows

Infrastructure

• added PyPy 3.11 to CI, added PyPy builds for all OSes
• use only pyproject.toml for dependencies, moved tox configuration into pyproject.toml

Fixes

• fixed a problem accessing size from a FakeFileWrapper object
  (see #​1276)
• fixed a problem with readable raising an error on a file object.
  (see #​1265)
• avoid memory accumulation in consecutive tests by using weak references
  (see #​1267)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.