ci: Fix additional label (#16085)

OK, general label adding works now, but the additional labels had a
typo, oops...

Author: mydea

.github/workflows/issue-package-label.yml

@@ -159,4 +159,4 @@ jobs:
         if: steps.additionalLabel.outputs.label != ''
         uses: actions-ecosystem/action-add-labels@v1
         with:
-          labels: ${{ steps.packageLabel.outputs.label }}
+          labels: ${{ steps.additionalLabel.outputs.label }}