Switch to pytest-freezer

[elupus]

Proposed change

• Switch to pytest-dev maintained freezer package instead of pytest-freezegun since the old repository is using deprecated features.
• Diff between version 0.4.2, which is a very close copy of pytest-freezegun 0.4.2, and 0.4.6:
  pytest-dev/pytest-freezer@0.4.2...0.4.6

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR is related to issue: Replace distutils.version with packaging.version.path ktosiek/pytest-freezegun#35 and Require pytest 3.6 to drop dependency on deprecated distutils ktosiek/pytest-freezegun#38

============================================================================================== warnings summary ==============================================================================================
venv/lib/python3.10/site-packages/pytest_freezegun.py:17: 48 warnings
  /Users/joakim/src/hass/home-assistant/venv/lib/python3.10/site-packages/pytest_freezegun.py:17: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
    if LooseVersion(pytest.__version__) < LooseVersion('3.6.0'):

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[epenet]

Makes sense.
Could you add a link to the release notes?

[MartinHjelmare]

Great!

I added a link to the version diff of pytest-freezer.

[elupus]

Thanks!