WEBRTC_BUILD_VERSION を m132.6834.4.0 に上げる

[torikizi]

• m132.6834.4.0 にアップデート
• ExportKeyingMaterial の廃止に対応
• requested_resolution が scale_resolution_down_to になった修正に追従

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This pull request includes updates to the WebRTC build version, changes to keying material export functions, and renaming of parameters related to resolution scaling in the codebase. The most important changes are summarized below:

Version Updates:

• Updated WebRTC build version from m131.6778.4.0 to m132.6834.4.0 in CHANGES.md, VERSION, and examples/VERSION files. [1] [2] [3]

Keying Material Export:

• Replaced ExportKeyingMaterial with ExportSrtpKeyingMaterial in srtp_keying_material_exporter.cpp due to deprecation. Added compatibility handling as ExportSrtpKeyingMaterial only accepts one argument compared to six in the previous function.

Resolution Scaling:

• Renamed requested_resolution to scale_resolution_down_to in sora_signaling.cpp to reflect updated parameter naming conventions. [1] [2]

[melpon]

よさそう

[torikizi]

レビューありがとうございます。こちらマージします。