[DRE-maint] Bug#1006352: bsfiltger: "Cannot load such file -- sdbm (LoadError)"

[YABUKI Yukiharu]

Package: bsfilter
Version: 1:1.0.19-2.1
Severity: grave
Justification: renders package unusable

Dear Maintainer,

Due to ruby transition, ruby could not load sdbm module.

I use bsfilter which classifies spam mail.

```
$ bsfilter 
<internal:/usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb>:85:in `require': cannot load such file -- sdbm (LoadError)
Did you mean?  dbm
        from <internal:/usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb>:85:in `require'
        from /usr/bin/bsfilter:3106:in `get_options'
        from /usr/bin/bsfilter:3262:in `setup'
        from /usr/bin/bsfilter:3413:in `<main>'
```


-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.16.0-1-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_WARN, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=ja_JP.UTF-8, LC_CTYPE=ja_JP.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages bsfilter depends on:
ii  ruby  1:3.0

bsfilter recommends no packages.

Versions of packages bsfilter suggests:
pn  ruby-mecab  <none>
pn  ruby-qdbm   <none>

-- no debconf information