Relax ucx pinning (#1927)

The latest builds of libarrow are built against ucx 1.15, so the upper bound constraint in raft is causing failures downstream when conda tries to solve environments containing both raft-dask and other packages that transitively bring in ucx via libarrow (namely cudf). This PR also bumps the minimum requirement to 1.14.1 to match ucx-py.

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - Peter Andreas Entschev (https://github.com/pentschev)
  - Ray Douglass (https://github.com/raydouglass)

URL: #1927

conda/recipes/raft-dask/conda_build_config.yaml

@@ -14,7 +14,7 @@ sysroot_version:
   - "2.17"
 
 ucx_version:
-  - ">=1.13.0,<1.15.0"
+  - ">=1.14.1,<1.16.0"
 
 ucx_py_version:
   - "0.35.*"