[tqdm] Update to 4.68.*

[brianschubert]

Closes #15872

Added an allowlist entry as a workaround for the tqdm._util module now being unimportable (seems to be an upstream bug):

$ uv run -w tqdm==4.68.0 python3 -c 'import tqdm._utils'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    import tqdm._utils
  File "/home/brian/.cache/uv/archive-v0/vSixbcDfu_MnLexX/lib/python3.14/site-packages/tqdm/_utils.py", line 4, in <module>
    from .utils import (  # noqa: F401, pylint: disable=unused-import
    ...<2 lines>...
        _screen_shape_windows, _screen_shape_wrapper, _supports_unicode, _term_move_up, colorama)
ImportError: cannot import name '_screen_shape_linux' from 'tqdm.utils' (/home/brian/.cache/uv/archive-v0/vSixbcDfu_MnLexX/lib/python3.14/site-packages/tqdm/utils.py)

Leaving more detailed overloads for the new itertools-esque functions as future work.

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉