put libucx back, it is needed in setup.py

dependencies.yaml

@@ -27,13 +27,6 @@ files:
       table: build-system
     includes:
       - build_python
-  py_rapids_build:
-    output: pyproject
-    pyproject_dir: .
-    extras:
-      table: tool.rapids-build-backend
-      key: requires
-    includes:
       - depends_on_ucx_build
   py_run:
     output: pyproject

pyproject.toml

@@ -16,6 +16,7 @@
 build-backend = "rapids_build_backend.build"
 requires = [
     "cython>=3.0.0",
+    "libucx==1.15.0",
     "rapids-build-backend>=0.3.0,<0.4.0dev0",
     "setuptools>=64.0.0",
 ] # This list was generated by `rapids-dependency-file-generator`. To make changes, edit dependencies.yaml and run `rapids-dependency-file-generator`.

setup.py

@@ -9,9 +9,6 @@
 import os
 from distutils.sysconfig import get_config_var, get_python_inc
 
-# TODO: delete this before merging. Just checking if this has to be available
-#       when setup.py is run.
-import libucx  # noqa: F401
 from Cython.Distutils.build_ext import new_build_ext
 from setuptools import setup
 from setuptools.extension import Extension