Update dependency flutter_webrtc to ^0.7.0 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
flutter_webrtc	dependencies	minor	^0.6.6 -> ^0.7.0

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Release Notes

cloudwebrtc/flutter-webrtc

### [`v0.7.0+hotfix.2`](https://togithub.com/cloudwebrtc/flutter-webrtc/releases/0.7.0+hotfix.2) [Compare Source](https://togithub.com/cloudwebrtc/flutter-webrtc/compare/0.7.0...0.7.0) \[0.7.0+hotfix.2] - 2021-10-22 - \[iOS/macOS] Update .podspec for Darwin. ### [`v0.7.0+hotfix.1`](https://togithub.com/cloudwebrtc/flutter-webrtc/releases/0.7.0+hotfix.1) [Compare Source](https://togithub.com/cloudwebrtc/flutter-webrtc/compare/0.7.0...0.7.0) \[0.7.0+hotfix.1] - 2021-10-21 - \[Android] Fix bug for createDataChannel. ### [`v0.7.0`](https://togithub.com/cloudwebrtc/flutter-webrtc/releases/0.7.0) [Compare Source](https://togithub.com/cloudwebrtc/flutter-webrtc/compare/0.6.10...0.7.0) \[0.7.0] - 2021-10-20 - \[Android] Enable Android simulcast ([#​731](https://togithub.com/cloudwebrtc/flutter-webrtc/issues/731)) - \[macOS] Use pre-compiled WebRTC for macOS. ([#​717](https://togithub.com/cloudwebrtc/flutter-webrtc/issues/717)) - \[iOS/macOS] Fix the correct return value of createDataChannel under darwin. - \[Windows] Fix using the wrong id to listen datachannel events. - \[Dart] Fix(mediaStreamTrackSetEnable): remote track is unavaiable ([#​723](https://togithub.com/cloudwebrtc/flutter-webrtc/issues/723)).

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