Hello There are still some links that would have to be converted from http to https in the packages part of debian.org.
example: <a href="http://deb.debian.org/debian/pool/main/h/horst/horst_5.1-2.dsc ">[horst_5.1-2.dsc]</a> (source: https://packages.debian.org/bullseye/horst ) Thank you JP