Deprecate Origin unicode_serialization (and bump the url version)

[evilpie]

Fixes #881

[micolous]

FYI #887 already fixed this and other deprecations – that's was just blocked on #886 to run wasm32 tests in CI.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@73803fa). Click here to learn what that means.

Additional details and impacted files

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##             main     #917   +/-   ##
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  Coverage        ?   81.77%           
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  Files           ?       20           
  Lines           ?     3551           
  Branches        ?        0           
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  Hits            ?     2904           
  Misses          ?      647           
  Partials        ?        0           

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