Fix time handling

[quthla]

Breaking change

Proposed change

Closes https://github.com/Limych/ha-gismeteo/issues/60

Time handling was a bit messy and overwriting default time zone of dt_util is also a bad idea as that might have an influence on other components and even HA itself

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (which adds functionality to an this integration)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:

Checklist

• [ ] The code change is tested and works locally.
• [ ] There is no commented out code in this PR.
• [ ] The code has been formatted using Black (black --fast custom_components)

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

• [ ] Documentation added/updated to README.md

[Limych]

Please fix lint errors:

custom_components/gismeteo/api.py:15:1: F401 'datetime.datetime' imported but unused

[vegetate7]

Is this PR abandoned by author? @Limych can you fix this youself?

ahh. Just forget about it. This PR is not compaible with latest dev (2.4.0-beta1 atm), because of timestamp / datetime messes.