Fix the job name for NumPy 1.21

Author: asmeurer

.github/workflows/array-api-tests-numpy.yml

@@ -3,7 +3,7 @@ name: Array API Tests (NumPy Latest)
 on: [push, pull_request]
 
 jobs:
-  array-api-tests-numpy:
+  array-api-tests-numpy-1-21:
     uses: ./.github/workflows/array-api-tests.yml
     with:
       package-name: numpy