Upgrade libwebrtc 131.0.6778.85-r1 #2286

Job	Run time
clippy (linux)	3m 4s
dartfmt	45s
dartanalyze	57s
clippy (macos)	3m 7s
build (linux)	3m 9s
build (macos)	1m 49s
clippy (windows)	2m 51s
build (windows)	2m 49s
ktfmt	11s
rustdoc (linux)	3m 4s
rustdoc (macos)	3m 6s
rustdoc (windows)	2m 46s
rustfmt	17s
swiftformat	8s
test (example, ${{ matrix.platform }})	1s
dart pub publish (pub.dev)	1s
pr	1s
release (GitHub)	1s
	28m 7s

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