deb11+12: Query source:Package instead of Source to get the list of packages
For packages whose binary and source versions differ (like those binNMU'ed), dpkg-query also returns the version of the source package along its name:
install ok installed gobgpd 3.10.0-1+b4 gobgp (3.10.0-1)
...making the grep matching afterwards to fail. So those packages are not identified by check-security-support.
Closes: #1106203