Update libwebrtc up to 08b882d762edadb9797334859d915c5c1e34896b
<rdar://problem/102366905>
Pull request: https://github.com/WebKit/WebKit/pull/6546
Committed 256778@main (4af71c6a875d): <https://commits.webkit.org/256778@main> Reviewed commits have been landed. Closing PR #6546 and removing active labels.