Update workflow build action

Use actions/upload-artifact@v4

Author: tonyroberts

.github/workflows/pelican.yml

@@ -21,7 +21,7 @@ jobs:
       env:
         GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
     - name: Upload build ouptut
-      uses: actions/upload-artifact@v1
+      uses: actions/upload-artifact@v4
       with:
         name: output
         path: output