[CMake] Update libvpx sources after 271668@main

https://bugs.webkit.org/show_bug.cgi?id=265864

Reviewed by Philippe Normand.

Also update sources for 271602@main, 271603@main and 271605@main.

* Source/ThirdParty/libwebrtc/CMakeLists.txt:
* Source/ThirdParty/libwebrtc/Source/webrtc/modules/congestion_controller/goog_cc/loss_based_bwe_v2.cc:

Canonical link: https://commits.webkit.org/272175@main

Author: dpino