Fix bundle update syntax in update_dep.sh
Fix bundle update syntax in update_dep.sh

Don't confuse gem and bundler flags.

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

mwrock/chef,nvwls/chef,martinisoft/chef,tas50/chef-1,MsysTechnologiesllc/chef,nvwls/chef,chef/chef,Tensibai/chef,mattray/chef,MsysTechnologiesllc/chef,tas50/chef-1,nvwls/chef,mattray/chef,chef/chef,MsysTechnologiesllc/chef,MsysTechnologiesllc/chef,martinisoft/chef,martinisoft/chef,tomdoherty/chef,jaymzh/chef,chef/chef,gene1wood/chef,nvwls/chef,mwrock/chef,tomdoherty/chef,gene1wood/chef,chef/chef,gene1wood/chef,mattray/chef,mwrock/chef,tas50/chef-1,nvwls/chef,tas50/chef-1,higanworks/chef,Tensibai/chef,tomdoherty/chef,mwrock/chef,jaymzh/chef,martinisoft/chef,tomdoherty/chef,mattray/chef,higanworks/chef,Tensibai/chef,Tensibai/chef,gene1wood/chef,higanworks/chef,Tensibai/chef,tomdoherty/chef,martinisoft/chef,higanworks/chef,mattray/chef,jaymzh/chef,jaymzh/chef,higanworks/chef,nvwls/chef