feat: Add fetch of binary needed for standard grpc python support (#3)

Author: unj1m

action.yaml

@@ -53,10 +53,9 @@ runs:
     - name: Install python dependencies # We use betterproto https://github.com/danielgtaylor/python-betterproto to generate python grpc code, so we have to install it
       shell: bash
       run: |
-        pip install "betterproto[compiler]"
-        pip install betterproto
+        pip install "betterproto[compiler]" grpclib protobuf
     - name: Run buf generate
       shell: bash
       working-directory: ${{ inputs.working-directory }}
       run: |
-        buf generate
+        buf generate