Replace as many occurrences as possible of master by main

[gsmet]

This is a consequence of the renaming of the master branch to main but I
also checked all the external URLs to see if they were changed or not. I
updated them if it was the case.

There are still a some problematic occurrences but they are mostly
related to external projects.

[famod]

Error: Unable to resolve action `DeLaGuardo/setup-graalvm@main`, unable to find version `main`

[gastaldi]

Error: Unable to resolve action `DeLaGuardo/setup-graalvm@main`, unable to find version `main`

When sed substitutions are not so reliable... 😆

[gastaldi]

We should be using a version, really: DeLaGuardo/setup-graalvm@3.1 as suggested in https://github.com/marketplace/actions/setup-graalvm-environment

[famod]

Or just 3 instead of 3.1 to receive updates for the 3.x line. Some other actions are also defined with just the major version. 🤷‍♂️

Edit: Ah, forget about that. The action repo does not provide major version tags...

[gsmet]

Error: Unable to resolve action DeLaGuardo/setup-graalvm@main, unable to find version main

Obviously I had to miss the one at the end of the file :/

When sed substitutions are not so reliable...

Couldn't use sed. There are a lot of master occurrences that we needed to keep. So I used Eclipse with preview and reviewed each change manually. It was a lot of fun.

We should be using a version, really: DeLaGuardo/setup-graalvm@3.1 as suggested in https://github.com/marketplace/actions/setup-graalvm-environment

As suggested by what? All their examples are using master. Not saying we shouldn't change it but we can do it in another PR.

[gsmet]

I changed the quarkiverse-docs branch and fixed the branch of the GH Action.

[gastaldi]

As suggested by what?

Click on the big green button and you'll see it 😉

[famod]

Keeping my fingers crossed, but now there is a merge conflict.

[gsmet]

I'll wait for the full CI run, then fix the conflict and merge.

[famod]

All green! 🎉