package/stress-ng: fix broken URL

Do the same as commit "12c01079 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 <sebastien.szymanski@armadeus.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
[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 <ricardo.martincoski@datacom.com.br>
Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>