Revert "Update rmm conda recipe pinning of librmm" (#743)

Reverts #738

Authors:
  - Ray Douglass (https://github.com/raydouglass)
  - Mike Wendt (https://github.com/mike-wendt)

Approvers:
  - Mike Wendt (https://github.com/mike-wendt)

URL: #743

conda/recipes/rmm/meta.yaml

@@ -23,7 +23,7 @@ requirements:
     - cmake >=3.14.0
   host:
     - python
-    - librmm {{ version }}=*_{{ GIT_DESCRIBE_NUMBER }}
+    - librmm {{ version }}
     - setuptools
     - cython >=0.29,<0.30
     - spdlog=1.7.0