fix(deps): update dependency rxdart_ext to ^0.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rxdart_ext (source)	dependencies	minor	^0.2.3 -> ^0.3.0

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Release Notes

hoc081098/rxdart_ext (rxdart_ext)

v0.3.0

Compare Source

• Accept Dart SDK versions above 3.0 (sdk: '>=2.12.0 <4.0.0').

• Only support rxdart: ^0.28.0.

• state_stream and not_replay_value_stream:

  • Implement lastEventOrNull for NotReplayValueStream and StateStream.

• single:

  • RxSingles.using
    • Convert all required positional parameters to required named parameters.
    • The disposer is now called after the future returned from StreamSubscription.cancel completes.
  • Remove Single.fromStream constructor, use Single.unsafeFromStream instead.

• Docs: update broken doc link (thanks to @​dungngminh).

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