pyrcb2's autopkg tests fail with Python 3.12:

[...]
252s === python3.12 ===
252s ============================= test session starts
==============================
252s platform linux -- Python 3.12.0+, pytest-7.4.3, pluggy-1.3.0
252s rootdir: /tmp/autopkgtest.2RAiQ9/autopkgtest_tmp
252s collected 36 items
252s
252s tests/test_accounts.py .........................
      [ 69%]
252s tests/test_itypes.py F...F......
      [100%]
252s
252s =================================== FAILURES
===================================
252s _________________________ TestItypes.test_idefaultdict

Dear submitter,

as the package pyrcb2 has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1064640

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)