Pin pytest-freezer to latest version 0.4.8

[pyup-bot]

This PR pins pytest-freezer to the latest release 0.4.8.

Changelog

0.4.8

What's Changed
* Fix packaging (again) by wimglenn in https://github.com/pytest-dev/pytest-freezer/pull/12


**Full Changelog**: https://github.com/pytest-dev/pytest-freezer/compare/0.4.7...0.4.8

0.4.7

What's Changed
* Add testing on Python 3.7, 3.11 and 3.12-dev in CI. Remove testing on 3.6 and 3.10. by hugovk in https://github.com/pytest-dev/pytest-freezer/pull/7
* run tests on weekly schedule by wimglenn in https://github.com/pytest-dev/pytest-freezer/pull/8
* configure hatch file selection  by wimglenn in https://github.com/pytest-dev/pytest-freezer/pull/10

New Contributors
* hugovk made their first contribution in https://github.com/pytest-dev/pytest-freezer/pull/7

**Full Changelog**: https://github.com/pytest-dev/pytest-freezer/compare/0.4.6...0.4.7

0.4.6

- use the context manager of freezegun rather than explicit start/stop

0.4.5

- Require Python >= 3.6
- Add lower bound on freezegun >= 1.0

0.4.4

- Transferred ownership to pytest-dev org
- Use upstream's default ignore patterns and don't mutate the marker kwargs

0.4.3

- added docstring to the fixture. this shows in the output of `pytest --fixtures`
- fixed license metadata so the whole text is not rendering on PyPI landing page :)

0.4.2

- Initial release. The version number is chosen for parity with current [pytest-freezegun](https://github.com/ktosiek/pytest-freezegun/releases) release.

Links

• PyPI: https://pypi.org/project/pytest-freezer
• Changelog: https://data.safetycli.com/changelogs/pytest-freezer/