Bump arduino/setup-protoc from 2 to 3 (#593)

Bumps [arduino/setup-protoc](https://github.com/arduino/setup-protoc) from 2 to 3.
- [Release notes](https://github.com/arduino/setup-protoc/releases)
- [Commits](arduino/setup-protoc@v2...v3)

---
updated-dependencies:
- dependency-name: arduino/setup-protoc
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -116,7 +116,7 @@ jobs:
         run: echo ::set-output name=PROTOBUF_VERSION::$(grep "^protobuf>=" test_requirements.txt | cut -f2 -d=)
         id: read_versions
       - name: Install Protoc
-        uses: arduino/setup-protoc@v2
+        uses: arduino/setup-protoc@v3
         with:
           version: "${{ steps.read_versions.outputs.PROTOBUF_VERSION }}"
           repo-token: ${{ secrets.GITHUB_TOKEN }}