package/stress-ng: bump to version 0.13.05

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>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>