Bump livekit ffi to 0.12.76 (#799)

Co-authored-by: cloudwebrtc <duanweiwei1982@gmail.com>
Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: 3 people

.github/workflows/build-rtc.yml

@@ -54,6 +54,10 @@ jobs:
           add: '["livekit-rtc/"]'
           default_author: github_actions
           message: generated protobuf
+          # Skip the default `git fetch --tags --force`: on this repo it pulls
+          # 100+ refs at once and the action aborts before committing. Committing
+          # generated stubs onto the PR head branch doesn't need a full fetch.
+          fetch: false
 
   build_wheels:
     name: Build RTC wheels (${{ matrix.archs }})