Update pyproject-fmt to 2.15.2

[adamtheturtle]

Update pyproject-fmt to 2.15.2.

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Note

Low Risk
Low risk: a patch-level dev-tool dependency update that only affects formatting/tooling in development/CI.

Overview
Updates the pinned dev dependency pyproject-fmt in pyproject.toml from 2.15.1 to 2.15.2.

^{Written by Cursor Bugbot for commit 3264eea. This will update automatically on new commits. Configure here.}