Job cancels when running multiple plugin dependencies with `extra_plugin_runners:`.

[MissionPhoenix]

Description
Running multiple extra plugin dependencies now fails since a change in November 2024 to make group name more unique.

More detail:
Error when evaluating 'concurrency' for job 'prepare_matrix'. catalyst/catalyst-moodle-workflows/.github/workflows/ci.yml@main (Line: 92, Col: 7): Concurrency group name must be less than 400 characters

Suggestion:
Remove -${{ inputs.extra_plugin_runners }} from the group.

Commit where change was introduced: catalyst/catalyst-moodle-workflows@8efee8a

Pull request where change was introduced: #134