fix: add max_length support to Gzip/Brotli decoders for urllib3 v2.6+ compatibility

[benijaichenco]

Fixes #491

Adds the required max_length=None parameter to decoder methods to maintain compatibility with urllib3 >= 2.6.0.

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[chandra-siri]

thanks @benijaichenco for contributing :)

[benijaichenco]

All set @chandra-siri :)

[BrennaEpp]

Thank you for contributing! We are missing test coverage for lines 692 and 743, do you think that is something you could add @benijaichenco?

[BrennaEpp]

Also the linter is failing

Run nox -s lint
google/resumable_media/requests/download.py:739:1: W293 blank line contains whitespace

[chandra-siri]

this property is not required for _GzipDecoder . It's needed only for _BrotliDecoder.

Please remove these lines.

[gpshead]

It'd also be good to add an explicit test against the latest urllib3 version in the .github/workflows/unittest.yml test matrix.