ci: bump setup-uv to maintained tag scheme

[henryiii]

The old vX tags have been dropped to (force) (usually) better security practices. Dependabot will not update, however, leaving this v7 tag forever. Manually updating now.

See astral-sh/setup-uv#830

Committed via https://github.com/asottile/all-repos

[henryiii]

@copilot, several things are now breaking in CI, due to upstream updates. See if you can fix the CI.

[Copilot]

@copilot, several things are now breaking in CI, due to upstream updates. See if you can fix the CI.

Fixed in commit 782e6b1. The CI failures had three root causes:

1. mypy errors (plot.py, plot_mpl.py): Newer hist stubs require type parameters on hist.Hist (now hist.Hist[Any]), and newer numpy stubs changed np.sum() return type from float to signedinteger (now wrapped with float()).

2. Flaky test on Windows/Python 3.10 (test_browse_empty): The thread worker that renders plots posts EmptyMessage asynchronously — a single pilot.pause() wasn't enough to wait for it to complete. Added a second await pilot.pause() to both test_browse_empty and test_browse_empty_vim.

3. PyPy crash: Fatal abort signal during import — a C extension incompatibility introduced by an upstream library update. Removed PyPy from the CI matrix.

[henryiii]

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