Template Conda recipe's requirements/host (#1425)

Pull in build dependencies from `pyproject.toml` into Conda's `meta.yaml`.

Authors:
  - https://github.com/jakirkham

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

URL: #1425

conda/recipes/dask-cuda/meta.yaml

@@ -29,8 +29,9 @@ requirements:
   host:
     - python
     - pip
-    - rapids-build-backend>=0.3.0,<0.4.0.dev0
-    - setuptools>=64.0.0
+    {% for r in data["build-system"]["requires"] %}
+    - {{ r }}
+    {% endfor %}
   run:
     - python
     {% for r in data["project"]["dependencies"] %}