Backport of TrustedQSL 2.7.5-1 to Bookworm

This should be a fast-forward update of the debian/bookwork-backport to the 2.7.5-1 release. No issues seen from some limited, interactive testing. I've also tagged this here:

https://salsa.debian.org/penguin359/trustedqsl/-/commits/debian/2.7.5-1_bpo12+1?ref_type=tags

And dropped it on mentors if that is helpful:

dget -x https://mentors.debian.net/debian/pool/main/t/trustedqsl/trustedqsl_2.7.5-1~bpo12+1.dsc