Fix install-deps.sh
Fix install-deps.sh

Install-deps would fail without requirements envvar set

credativUK/vdirsyncer,untitaker/vdirsyncer,tribut/vdirsyncer,credativUK/vdirsyncer,hobarrera/vdirsyncer,mathstuf/vdirsyncer,untitaker/vdirsyncer,tribut/vdirsyncer,untitaker/vdirsyncer,hobarrera/vdirsyncer,mathstuf/vdirsyncer