chore(deps): update pyfakefs requirement

Updates the requirements on [pyfakefs](https://github.com/pytest-dev/pyfakefs) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pyfakefs/releases)
- [Changelog](https://github.com/pytest-dev/pyfakefs/blob/main/CHANGES.md)
- [Commits](pytest-dev/pyfakefs@v4.5.3...v6.1.6)

---
updated-dependencies:
- dependency-name: pyfakefs
  dependency-version: 6.1.6
  dependency-type: direct:development
...

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Author: dependabot[bot]

setup.cfg

@@ -56,7 +56,7 @@ dev =
     mypy>=1,<2
     pre-commit==3.5.0
     psutil==7.2.2
-    pyfakefs>=4.5.3,<=5.6.0
+    pyfakefs>=4.5.3,<=6.1.6
     pytest==8.4.1
     pytest-cov==7.0.0
     pytest-httpx>=0.13.0