Bump actions/upload-artifact from 4 to 5 (#3214)

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.github/workflows/validate-atomics.yml

@@ -69,7 +69,7 @@ jobs:
         env:
           PYTHONPATH: ${{ github.workspace }}
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           name: labels.json
           path: atomic_red_team/pr/