Bump geojson_client to 0.6

[exxamalte]

Breaking change

Proposed change

Bump geojson_client to version 0.6.

Adds a default Accept-Encoding: deflate, gzip request header. (fixes #47046)
Adds Python 3.8 and 3.9 support.
Adds capability to define filters on update (for future improvements).
All changes here: https://github.com/exxamalte/python-geojson-client/blob/master/CHANGELOG.md

I also added myself as codeowner to geo_json_events integration.

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)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes geojson_client fetch fails with 406 #47046
• This PR is related to issue:
• Link to documentation pull request:

Checklist

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[janiversen]

Looks good