Updated default protoc version from 23.x to 26.x

[pdebakker-auguria]

Despite the readme saying that if you omit the version you will get the latest version, it actually installs version 23.x.
This one is outdated, and so I updated the default value to 26.x.

I'd prefer to see it not so hardcoded, but I figured this was a good short-term solution for the time being.

[CLAassistant]

All committers have signed the CLA.

[alessio-perugini]

I will merge this without tagging a new minor. When we will implement the logic that automatically retrieve the latest I'd go with a minor bump

[pdebakker-auguria]

Wow that was fast.
@alessio-perugini thank you for approving it.

I do have a question. I wanted to run this locally to test, but while I see a docs folder with a file called contributors.md, I dont see what steps I need to do to get things up and running locally.

Could you please tell me?

[alessio-perugini]

@pdebakker-auguria Sure locally you'll need to have node v20 you can use the awesome https://github.com/nvm-sh/nvm?tab=readme-ov-file#installing-and-updating
to manage multiple node installation.

Assuming you have already installed node and git and running on linux/mac

git clone git@github.com:arduino/setup-protoc.git
cd setup-protoc

npm install
npm run test

Should be enough to have the test running