Increase UCX upper pin to 1.19 (#740)

Increase upper UCX pin to 1.19 to allow us supporting UCX 1.18 that is needed for RAPIDS 25.02.

Authors:
  - Peter Andreas Entschev (https://github.com/pentschev)

Approvers:
  - Gil Forsyth (https://github.com/gforsyth)
  - James Lamb (https://github.com/jameslamb)

URL: #740

conda/recipes/versions.yaml

@@ -13,4 +13,4 @@ numpy_version:
 nvtx_version:
   - '>=0.2.1,<0.3'
 ucx_version:
-  - '>=1.15.0,<1.18.0'
+  - '>=1.15.0,<1.19.0'