update CI to use protobuf 4.x (#396)

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

Author: davidzhao

.github/workflows/build-protocol.yml

@@ -36,7 +36,7 @@ jobs:
       - uses: actions/setup-python@v4
 
       - name: Install Protoc
-        uses: arduino/setup-protoc@v2
+        uses: arduino/setup-protoc@v3
         with:
           version: "25.1"
           repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/build-rtc.yml

@@ -38,12 +38,12 @@ jobs:
       - name: Install Protoc
         uses: arduino/setup-protoc@v3
         with:
-          version: "26.x"
+          version: "25.1"
           repo-token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Install deps
         run: |
-          pip3 install mypy-protobuf==3.6.0
+          pip3 install mypy-protobuf==3.6.0 "protobuf>=4.25.0,<5.0.0"
 
       - name: generate python stubs
         run: ./generate_proto.sh

livekit-rtc/livekit/rtc/_proto/audio_frame_pb2.py

@@ -58,7 +58,7 @@ def finalize_options(self):
     license="Apache-2.0",
     packages=setuptools.find_namespace_packages(include=["livekit.*"]),
     python_requires=">=3.9.0",
-    install_requires=["protobuf>=5.26.1", "types-protobuf>=3", "aiofiles>=24"],
+    install_requires=["protobuf>=4.25.0", "types-protobuf>=3", "aiofiles>=24"],
     package_data={
         "livekit.rtc": ["_proto/*.py", "py.typed", "*.pyi", "**/*.pyi"],
         "livekit.rtc.resources": ["*.so", "*.dylib", "*.dll", "LICENSE.md", "*.h"],