Labeler action doesn't remove "needs release notes" labels

[dstansby]

The labeler action doesn't seem to be removing "needs release notes" labels when release notes are correclty added to PRs. This should be fixed so when a release note is added, the label is automatically removed.

Not sure if this is an issue with our config, or a bug with the labeler action.

[moradology]

Looks to me like bad configuration. sync-labels is set up appropriately, but the rule currently is to add the label if ANY change is made to a file not in changes/*.rst. Sync can only change things if that condition is voided later, which seems unlikely. We probably want all/all, based on https://github.com/actions/labeler and my now-quite-rusty mastery of syllogistic logic

[jhamman]

#2781 seemed to break things...

https://github.com/zarr-developers/zarr-python/actions/runs/13077640517/job/36493605694?pr=2778

[jhamman]

Okay, all good now. Thanks @moradology.

Ref showing that this is working on active PRs -> #2778 (comment)