(build) Switch to deleting old labels

Initial sync of labels worked as expected, so let's get any old labels purged!

Author: gep13

.github/workflows/label-sync.yml

@@ -19,6 +19,6 @@ jobs:
           config-file: |
             https://raw.githubusercontent.com/chocolatey/.github/main/.github/labels.yml
           request-token: ${{ secrets.SYNC_TOKEN }} # Used when getting the config files.
-          delete-other-labels: false # After initial run, and verification change this to true
+          delete-other-labels: true # After initial run, and verification change this to true
           dry-run: false
           token: ${{ secrets.SYNC_TOKEN }} # Used when updating the labels on the repository.