Revert "Install protoc from repository"

This reverts commit e87ddee.

Author: Taknok

.github/workflows/build_pull_request.yml

@@ -28,7 +28,9 @@ jobs:
           add-to-path: false
 
       - name: Get protoc
-        run: sudo apt-get install -y protobuf-compiler
+        run: |
+          wget https://github.com/protocolbuffers/protobuf/releases/download/v21.12/protoc-21.12-linux-x86_64.zip
+          sudo unzip -j protoc-*.zip bin/protoc -d /usr/local/bin/
 
       - name: Patch
         run: ./patch.sh