Update actions/download-artifact digest to cc20338

Author: renovate[bot]

.github/workflows/integration_test.yml

@@ -105,7 +105,7 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
       - name: Download charm artifact
-        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4
+        uses: actions/download-artifact@cc203385981b70ca67e1cc392babf9cc229d5806 # v4
         with:
           name: charm
           path: ${{ github.workspace }}/charm