Another small gh-action workflow fix.

[cmaglie]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

A small change in the sync-label workflow: the 'name' value ${{ env.CONFIGURATIONS_ARTIFACT }} would not match the name of the produced intermediate artifacts. The correct pattern is ${{ env.CONFIGURATIONS_ARTIFACT }}-*.

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change, and is titled accordingly?

Other information

[cmaglie]

Test successful:

Run geekyeggo/delete-artifact@v5
  with:
    name: label-configuration-files-*
    token: ***
    useGlob: true
    failOnError: true
  env:
    CONFIGURATIONS_FOLDER: .github/label-configuration-files
    CONFIGURATIONS_ARTIFACT: label-configuration-files
    MERGED_CONFIGURATION_PATH: /home/runner/work/_temp/labels.yml
  
Found [2](https://github.com/arduino/arduino-cli/actions/runs/10181981362/job/28163472580?pr=2682#step:6:2) artifact(s)
Artifact 'label-configuration-files-universal.yml' (ID: 1760459[3](https://github.com/arduino/arduino-cli/actions/runs/10181981362/job/28163472580?pr=2682#step:6:3)00) deleted
Successfully deleted artifact: "label-configuration-files-universal.yml"
Artifact 'label-configuration-files-tooling.yml' (ID: 1760[4](https://github.com/arduino/arduino-cli/actions/runs/10181981362/job/28163472580?pr=2682#step:6:4)59381) deleted
Successfully deleted artifact: "label-configuration-files-tooling.yml"