Use uv for building and uploading instead of setup.py

Author: CoolCat467

Makefile

@@ -48,7 +48,9 @@ tag:
 pypi:   tag
 	@if python3 python3 -c "from trio_asyncio._version import __version__; print(__version__)" 2>/dev/null | grep -qs + >/dev/null 2>&1 ; \
 		then echo "You need a clean, tagged tree" >&2; exit 1 ; fi
-	python3 setup.py sdist upload
+	python3 -m pip install uv
+	uv build
+	uv publish
 	## version depends on tag, so re-tagging doesn't make sense
 
 upload: pypi