Missing event type: `merge_group`

[aarokorhonen]

Given the following Actions workflow definition:

name: Run on PR
run-name: Run on PR, ref: "${{ github.head_ref || github.event.merge_group.head_ref }}" # ← Warning

on:
    pull_request:
    merge_group:
        types:
            - checks_requested

jobs:
    # ...

The VSCode GitHub Actions produces the following warning on the run-name definition:

Context access might be invalid: merge_group

While in fact the workflow would work fine with the recently added merge_group event.

I tracked the issue to this repository – please let me know if you would prefer me to open the issue in another repository.

I am happy to contribute a fix if it is as simple as adding the new event type into the schema definition file.