doc: fixed build command

Author: aaltat

BUILD.md

@@ -166,7 +166,7 @@ respectively.
 3.  Create source distribution and universal (i.e. Python 2 and 3
     compatible) [wheel](http://pythonwheels.com):
 
-        python setup.py sdist bdist_wheel --universal
+        uv build
         ls -l dist
 
     Distributions can be tested locally if needed.