Extend a0f8e62d by improving the transitional package metadata

This fixes the following Lintian warnings:

• debhelper-but-no-misc-depends mariadb-server-10.5
• transitional-package-not-oldlibs-optional database/optional

See also

• https://manpages.debian.org/bookworm/debhelper/debhelper.7.en.html#Automatic_generation_of_miscellaneous_dependencies.
• https://www.debian.org/doc/manuals/developers-reference/best-pkging-practices.en.html#make-transition-packages-deborphan-compliant

This targets the debian/bookworm branch directly with the permission/request of release maintainers at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1037107#87