Update actions/upload-artifact digest to 4cec3d8

Author: renovate[bot]

.github/workflows/integration_test.yml

@@ -62,7 +62,7 @@ jobs:
         working-directory: charm
 
       - name: Upload charm artifact
-        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4
+        uses: actions/upload-artifact@4cec3d8aa04e39d1a68397de0c4cd6fb9dce8ec1 # v4
         with:
           name: charm
           path: ./charm/*.charm
@@ -123,7 +123,7 @@ jobs:
 
       - name: Upload charmcraft logs
         if: failure()
-        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4
+        uses: actions/upload-artifact@4cec3d8aa04e39d1a68397de0c4cd6fb9dce8ec1 # v4
         with:
           name: charmcraft-logs
           path: /home/runner/.local/state/charmcraft/log/*