Bump google.golang.org/protobuf from 1.31.0 to 1.33.0 in /grpc-proxy #330

	name: Continuous Integration
	on:
	pull_request:
	push:
	branches:
	- main

	jobs:
	build-and-test:
	runs-on: ubuntu-latest
	steps:
	- name: Print build information
	run: "echo head_ref: ${{ github.head_ref }}, ref: ${{ github.ref }}"
	- uses: actions/checkout@v2
	with:
	submodules: recursive
	- uses: actions/setup-go@v2
	with:
	go-version: "1.21"
	- name: CI Build
	run: make ci-build

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