Bump actions/download-artifact from 3 to 4 (#44)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/nightly.yml

@@ -67,7 +67,7 @@ jobs:
 
     steps:
     - name: Get all artifacts
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
     - name: Zip each artifact
       run: find . -type d ! -path . -execdir zip -9 -rj "{}.zip" "{}" \;