Cannot checkout all submodules

[gdaniel]

The wiki specifies how to update all the submodules to the master branch with the following command:

git submodule foreach 'git checkout master'

This doesn't work since we added the intent providers, processors, and monitoring components, because new repositories have their default branch set to main. We need to update the old repositories to also use main, but we need to make sure it doesn't break critical installations.