Bump pytest-freezer from 0.4.8 to 0.4.9 (#320)

Bumps [pytest-freezer](https://github.com/pytest-dev/pytest-freezer) from 0.4.8 to 0.4.9.
- [Release notes](https://github.com/pytest-dev/pytest-freezer/releases)
- [Commits](pytest-dev/pytest-freezer@0.4.8...0.4.9)

---
updated-dependencies:
- dependency-name: pytest-freezer
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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