Increment Max CuPy Version in CI (#328)

Allow for CuPy 9.0 when available on conda channels.

Authors:
  - Adam Thompson (@awthomp)

Approvers:
  - AJ Schmidt (@ajschmidt8)
  - Brad Rees (@BradReesWork)

URL: #328

conda/recipes/cusignal/meta.yaml

@@ -28,7 +28,7 @@ requirements:
     - numpy>=1.17.3
     - boost
     - numba>=0.49.0
-    - cupy>=8.0.0,<9.0.0a0
+    - cupy>=8.0.0,<9.1.0a0
 
 test:
   requires: