tests/comparators/test_ffprobe.py broken with ffmpeg 4.4

Upgrading from ffmpeg 4.3.1 to ffmpeg 4.4 breaks the ffprobe test:

=================================== FAILURES ===================================
__________________________________ test_diff ___________________________________

differences = [<Difference ffprobe -- ffprobe []>]

    @skip_unless_tools_exist("ffprobe")
    def test_diff(differences):
>       assert_diff(differences[0], "mp3_expected_diff")

tests/comparators/test_ffprobe.py:47: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

difference = <Difference ffprobe -- ffprobe []>, filename = 'mp3_expected_diff'

    def assert_diff(difference, filename):
>       assert difference.unified_diff == get_data(filename)
E       AssertionError

tests/utils/data.py:50: AssertionError
=========================== short test summary info ============================
FAILED tests/comparators/test_ffprobe.py::test_diff - AssertionError
====== 1 failed, 425 passed, 39 skipped, 5 deselected in 77.36s (0:01:17) ======
error: builder for '/nix/store/c8d40h71kqswh6nlcgyzqp5705sq8d7v-diffoscope-171.drv' failed with exit code 1;
       last 10 log lines:
       > difference = <Difference ffprobe -- ffprobe []>, filename = 'mp3_expected_diff'
       >
       >     def assert_diff(difference, filename):
       > >       assert difference.unified_diff == get_data(filename)
       > E       AssertionError
       >
       > tests/utils/data.py:50: AssertionError
       > =========================== short test summary info ============================
       > FAILED tests/comparators/test_ffprobe.py::test_diff - AssertionError
       > ====== 1 failed, 425 passed, 39 skipped, 5 deselected in 77.36s (0:01:17) ======

The issue appears to be that the last line of the ffprobe output containing the "Stream" info now has a different number of spaces: https://salsa.debian.org/reproducible-builds/diffoscope/-/blob/175/tests/data/mp3_expected_diff

Comparing the ffprobe output for test1.mp3 using both versions produces the following output:

$ diff <(/nix/store/5ndchrs9mcvpvvcl9mjphdq5jsg5ynpl-ffmpeg-4.3.1-bin/bin/ffprobe tests/data/test1.mp3 2>&1) <(/nix/store/kh3gy6zdrnbrsx74nd13ilqbzls39kpr-ffmpeg-4.4-bin/bin/ffprobe tests/data/test1.mp3 2>&1)
[ snipped irrelevant changes]
<     Stream #0:0: Audio: mp3, 8000 Hz, mono, fltp, 8 kb/s
---
>   Stream #0:0: Audio: mp3, 8000 Hz, mono, fltp, 8 kb/s

Downstream nixpkgs issue: https://github.com/NixOS/nixpkgs/pull/124175

(I could submit the trivial change to make it work with ffmpeg 4.4, but I wasn't sure exactly how you intended to handle small variations in output based on version issues like this.)