Remove run_constrained

Author: hcho3

recipe/meta.yaml

@@ -91,8 +91,6 @@ outputs:
         - {{ pin_compatible("cuda-version", lower_bound="11.2") }}  # [cuda_compiler == "nvcc"]
         - {{ pin_compatible("cuda-version", min_pin="x") }}         # [cuda_compiler == "cuda-nvcc"]
         - libgomp                                                   # [win]
-      run_constrained:
-        - {{ pin_compatible('librmm', max_pin='x.x') }}             # [linux and cuda_compiler != "None"]
     test:
       commands:
         - test -f "${PREFIX}/lib/libxgboost${SHLIB_EXT}"                  # [unix]