Describe the problem

Protobuf has recently changed its versioning scheme. The release after 3.20 is named 21.0.

To reproduce

Sample workflow:

      - name: install protoc
        uses: arduino/setup-protoc@master
        with:
            version: 21.1

Expected behavior

protoc --version shows 3.21.1

'arduino/setup-protoc' version

v1

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest version
• My report contains all necessary details