maint: fix pedantic zizmor problems

.github/workflows/packages-cleanup.yml

@@ -25,6 +25,10 @@ on:
         default: true
         type: boolean
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: false
+
 env:
   PACKAGE_NAME: "freqtrade"
 
@@ -37,7 +41,7 @@ jobs:
     runs-on: ubuntu-24.04
     if: github.repository == 'freqtrade/freqtrade'
     permissions:
-      packages: write
+      packages: write  # Needed to delete package versions
 
     steps:
     - name: "Delete untagged Package Versions"