chore(deps): update dependency wrtc to ^0.4.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
wrtc	^0.4.4 -> ^0.4.7

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Release Notes

node-webrtc/node-webrtc

v0.4.7

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New Features

• Updated the "engines" property of package.json to use a range (thanks @​piranna).

v0.4.6

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New Features

• Added target property to RTCPeerConnection events (thanks, @​CharlesRA).
• Support for additional APIs in lib/browser.js (thanks, @​piranna).
• Added a naïve version of getDeviceMedia that delegates to getUserMedia
  (thanks, @​piranna).

Bug Fixes

• Although Node 14 support was confirmed in v0.4.5, it was not included in the
  "engines" property of package.json (thanks, @​farnabaz).
• Potential fix for a crash mentioned in #​637 (thanks, @​thedracle).

v0.4.5

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=====

New Features

• Updated to WebRTC M81.
• Added support for Node 14.
• Added rollback support.

Bug Fixes

• RTCPeerConnection no longer raises "icegatheringstatechange" when the
  RTCPeerConnection is closed. Thanks, @​arlolra. (#​625)

Breaking Changes

• With the update from M79 to M81, the dtx, ptime, and codecPayloadType
  parameters to RTCRtpEncodingParameters no longer take affect. They've also
  been removed from the WebRTC 1.0 specification (see here).
  Although this is technically a SemVer-breaking change, few users of this
  library are depending on the removed functionality, and I prefer not to
  increment the version number at this time.

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[DiegoRBaquero]

🎉 This PR is included in version 9.17.1 🎉

The release is available on:

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• GitHub release

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