Relax version requirements for py-uv-build.

--- pyproject.toml.orig	2026-07-29 22:32:42 UTC
+++ pyproject.toml
@@ -40,7 +40,7 @@ Bug = "https://github.com/jazzband/dj-database-url/iss
 Bug = "https://github.com/jazzband/dj-database-url/issues"
 
 [build-system]
-requires = ["uv_build>=0.9.17,<0.10.0"]
+requires = ["uv_build>=0.9.17"]
 build-backend = "uv_build"
 
 [tool.uv.build-backend]