Import Debian changes 241-7~deb10u6

systemd (241-7~deb10u6) buster; urgency=medium

  * journal: do not trigger assertion when journal_file_close() get NULL
    (Closes: #975561)
  * test-bpf: skip test when run inside containers.
    The test reliably fails inside LXC and Docker when run on a new enough
    kernel. It's unclear whether this is a kernel, LXC/Docker or systemd
    issue and apparently there is no real interest to get this fixed, so
    let's skip this test.
  * autopkgtest: mark networkd-test.py as flaky.
    See https://github.com/systemd/systemd/issues/18357
    and https://github.com/systemd/systemd/issues/18196