Update dependency mediabunny to v1.20.0

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This PR contains the following updates:

Package	Change	Age	Confidence
mediabunny (source)	1.19.0 -> 1.20.0

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Release Notes

Vanilagy/mediabunny (mediabunny)

v1.20.0

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This update's core new feature is transparent video!

• Added support for reading and writing transparency data within WebM/Matroska, which uses the new sideData.alpha field in EncodedPacket.
• Implemented decoding of packets with alpha data, automatically resulting in a VideoSample with a pixel format that support alpha (such as RGBA, BGRA or I420A).
• Implemented encoding of frames with alpha data, resulting in an EncodedPacket with sideData.alpha populated. Enable this by setting alpha: 'keep' in VideoEncodingOptions.
• Improved error bubbling when encoding media
• VideoSample and AudioSample now implement the Disposable interface
• Fixed crash when reading the header of RF64 WAVE files (#​146)

v1.19.1

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• Made stripped Node.js import more resilient for certain bundler environments

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