bootstrap.sh: use old key for wheezy
bootstrap.sh: use old key for wheezy

> E: Release signed by unknown key (key id 6FB2A1C265FFB764)
>    The specified keyring /usr/share/keyrings/debian-archive-keyring.gpg may be incorrect or out of date.

Change-Id: If5454c160e1e4210ff64e9715a1ded1f665e6ac5

sipwise/kamailio-deb-jenkins,sipwise/kamailio-deb-jenkins