Flaky test

[danielhollas]

Unfortunately, the test modified in #6829 is now flaky.

https://github.com/aiidateam/aiida-core/actions/runs/18305515401/job/52121678975?pr=7040

FAILED tests/storage/psql_dos/test_backend.py::test_get_info - AssertionError: assert '2025-10-07 0....274596+00:00' == '2025-10-07 0....317672+00:00'
  - 2025-10-07 07:56:17.317672+00:00
  ?                  ^ ^^^^ --
  + 2025-10-07 07:56:06.274596+00:00
  ?                  ^^^^ ^^^

[danielhollas]

Ugh, still flaky :-(