package/stress-ng: fix broken URL

package/stress-ng: fix broken URL

Do the same as commit "12c01079bd package/stress-ng: bump to version
0.13.05" did for 2022.02 but without the version bump.

The project URL returns 404 error because:

Quoting Coling King:
"Unfortunately when I left Canonical last week they removed my tarballs"

So use github and update hash.

Signed-off-by: Sébastien Szymanski <[email protected]>
Cc: Arnout Vandecappelle (Essensium/Mind) <[email protected]>
[Ricardo: do not bump the version.
 There will be no version clash at sources.buildroot.net since the file
 format changed]
Signed-off-by: Ricardo Martincoski <[email protected]>
Cc: Romain Naour <[email protected]>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <[email protected]>