fix: upload and merge artifact naming conflict since action version v4

.github/actions/merge/action.yml

@@ -13,7 +13,6 @@ runs:
   using: "composite"
   steps:
     - name: Download digests
-      working-directory: /tmp/digests
       uses: actions/upload-artifact/merge@v4
       with:
         name: digests
@@ -31,7 +30,6 @@ runs:
         tags: ${{ inputs.tags }}
 
     - name: Create manifest list and push
-      working-directory: /tmp/digests
       shell: bash
       run: |
         docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \