FTBFS due build-time test failing

From the mantic rebuild report[1], we have this build failure[2]:

----------------------------- Captured stderr call -----------------------------
Process Process-6:
Traceback (most recent call last):
  File "/usr/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/usr/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/<<PKGBUILDDIR>>/unit_tests/freshclam_test.py", line 779, in mock_database_mirror
    server = HTTPServer(('', port), handler)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/socketserver.py", line 456, in __init__
    self.server_bind()
  File "/usr/lib/python3.11/http/server.py", line 136, in server_bind
    socketserver.TCPServer.server_bind(self)
  File "/usr/lib/python3.11/socketserver.py", line 472, in server_bind
    self.socket.bind(self.server_address)
OSError: [Errno 98] Address already in use
=============================== warnings summary ===============================
freshclam_test.py:20
  /<<PKGBUILDDIR>>/unit_tests/freshclam_test.py:20: DeprecationWarning: 'cgi' is deprecated and slated for removal in Python 3.13
    import cgi

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
=========================== short test summary info ============================
FAILED freshclam_test.py::TC::test_freshclam_07_cdiff_partial_minus_2 - asser...
============== 1 failed, 9 passed, 1 skipped, 1 warning in 20.92s ==============

83% tests passed, 1 tests failed out of 6

Total Test time (real) = 28.89 sec

The following tests FAILED:
   5 - freshclam (Failed)

1. https://people.canonical.com/~ginggs/ftbfs-report/test-rebuild-20230830-mantic-mantic.html#ubuntu-server-team
2. https://launchpadlibrarian.net/685127797/buildlog_ubuntu-mantic-amd64.clamav_1.0.2+dfsg-1ubuntu1_BUILDING.txt.gz