`__version__` access should raise an appropriate warning category

[flying-sheep]

I’d expect a DeprecationWarning or FutureWarning, not a generic UserWarning that can’t be filtered.

markupsafe/src/markupsafe/__init__.py

Lines 387 to 392 in 620c06c

	warnings.warn(
	"The '__version__' attribute is deprecated and will be removed in"
	" MarkupSafe 3.1. Use feature detection, or"
	' `importlib.metadata.version("markupsafe")`, instead.',
	stacklevel=2,
	)

Background: scverse/session-info2#96