Delete ignore directive for Ruff rule that was removed

[correctmost]

PR Description:

The unpacked-list-comprehension rule was removed in Ruff 0.8.0:

• https://docs.astral.sh/ruff/rules/unpacked-list-comprehension/
• https://astral.sh/blog/ruff-v0.8.0#removal-of-six-deprecated-rules

This PR fixes the following warning with Ruff 0.8.0:

warning: The following rules have been removed and ignoring them has no effect:
    - UP027