Update dependency flutter_webrtc to ^0.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_webrtc	dependencies	minor	^0.5.8 -> ^0.6.0

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Release Notes

cloudwebrtc/flutter-webrtc

v0.6.4

Compare Source

[0.6.4] - 2021.05.02

• [Android] Fix getting screen capture on Huawei only successful in the first time. (#​523)
• [Android] Add configuration "cryptoOptions" in parseRTCConfiguration().
• [Dart] Change getLocalDescription,getRemoteDescription,RTCRtpSenderWeb.track returns to nullable.
• [Dart] Fixed bug in RTCPeerConnectionWeb.removeTrack.
• [Dart] Change MediaStreamTrack.captureFrame returns to ByteBuffer to compatible with web API.
• [Dart] Do null safety check in onRemoveStream,onRemoveTrack and MediaStream.getTrackById.
• [Android] Add reStartCamera method when the camera is preempted by other apps.
• [Web] Refactored RTCVideoRendererWeb and RTCVideoViewWeb, using video and audio HTML tags to render audio and video streams separately.

v0.6.3

Compare Source

[0.6.3] - 2021.04.03

• [Dart] Change RTCRtpSender.track to nullable.
• [Web] Fix RTCVideoView/Renderer pauses when changing child in IndexedStack.

v0.6.2

Compare Source

[0.6.2] - 2021.04.02

• [Dart] Use enumerateDevices instead of getSources.
• [Android] Use flutter_background to fix screen capture example.

v0.6.1

Compare Source

[0.6.1] - 2021.04.02

• [Darwin] Fixed getting crash when calling setLocalDescription multiple times.
• [Dart] Get more pub scores.

v0.6.0

Compare Source

[0.6.0] - 2021.04.01

• [Sponsorship] Thanks for Stream sponsorship (#​475)
• [Android] Fixed a crash when switching cameras on Huawei devices.
• [Windows] Correct signalingState & iceConnectionState event name on Windows. (#​502)
• [Dart] Clip behaviour. (#​511)
• [Dart] null-safety (@​wer-mathurin Thanks for the hard work).
• [Dart] Fix setMicrophoneMute (#​466)
• [Web] Fix pc.addTransceiver method, fix RTCRtpMediaType to string, fix (#​437)
• [Android] fix sdpSemantics issue (#​478)

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