Update to make notebook_list.py compatible with numba 0.53 (#1455)

A recent update to numba 0.53 in CI broke this script and caused CI failures. This makes the script compatible with both pre and post numba 0.53 versions.

Tested in a local env with numba 0.53 installed.

Authors:
  - Rick Ratzel (@rlratzel)

Approvers:
  - Alex Fender (@afender)
  - Brad Rees (@BradReesWork)
  - Chuck Hastings (@ChuckHastings)
  - AJ Schmidt (@ajschmidt8)

URL: #1455

Author: rlratzel

ci/gpu/notebook_list.py

@@ -24,7 +24,9 @@
 pascal = False
 
 device = cuda.get_current_device()
-cc = getattr(device, 'COMPUTE_CAPABILITY')
+# check for the attribute using both pre and post numba 0.53 names
+cc = getattr(device, 'COMPUTE_CAPABILITY', None) or \
+     getattr(device, 'compute_capability')
 if (cc[0] < 7):
     pascal = True