Update build backend

Author: cthoyt

pyproject.toml

@@ -1,8 +1,6 @@
 [build-system]
-requires = ["uv>=0.5.13,<0.7.0"]
-# The uv backend entered preview mode in https://github.com/astral-sh/uv/pull/8886/files
-# with the 0.5.0 release. See also https://github.com/astral-sh/uv/issues/3957 for tracking.
-build-backend = "uv"
+requires = ["uv_build>=0.6.6,<1.0"]
+build-backend = "uv_build"
 
 [project]
 name = "biolookup"