firebird4.0 (4.0.5.3140.ds6-11) unstable; urgency=medium
.
* Upload to unstable
Which now takes over firebird-dev.
Which now means reverse-dependencies build against 4.0 firebird but do have
Depends: libreoffice-core-nogui | libreoffice-core, firebird3.0-server-core, ucf, libc6 (>= 2.14), libfbclient2 (>= 3.0.12~), libgcc-s1 (>= 3.3.1), libstdc++6 (>= 11), libuno-cppu3t64 (>= 4.4.0~alpha), libuno-cppuhelpergcc3-3t64 (>= 5.3.0~alpha), libuno-sal3t64 (>= 5.3.0~alpha), libuno-salhelpergcc3-3t64 (>= 1.4.0), uno-libs-private
in their Depends:, which might not work, will it?
(see https://salsa.debian.org/libreoffice-team/libreoffice/libreoffice/-/blob/master/rules?ref_type=heads#L1631 ff.)