Update docs-build.yaml to use v6 actions/download-artifact (#295)

/not-latest

Signed-off-by: Andrew Chen <[email protected]>

Author: chenopis

.github/workflows/docs-build.yaml

@@ -140,7 +140,7 @@ jobs:
           git config user.name docs-build
           git config user.email [email protected]
       - name: Download artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: html-build-artifact
       - name: Copy HTML directories