About dialog says version is still 3.20.0
I built Seahorse 3.29.92 on Debian. I installed it and ran it. I then opened the About dialog and it is reporting the version is still 3.20.0.
I tried searching the code and saw there is an about dialog created in common/catalog.vala but maybe that code isn't used. (That should at least update the copyright year to 2018).