[Github] Update actions/download-artifact to v5 (#158466)
Some of the older versions have security issues. Upgrade to v5 to remedy
that and get ahead of the v5 upgrade cycle rather than updating to a
later v4.x release.
Updated mechanically using the following command:
find .github -exec sed -i -e
"s/actions\/download-artifact@.*/actions\/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0
# v5.0.0/g" {} \;
