benchmarks/siege: update version 3.0.8 => 3.0.9

Differential Revision:	https://reviews.freebsd.org/D1389
Approved by:	bapt(mentor), marino(mentor)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@375774 35697150-7ecd-e111-bb59-0022644237b5