fix lib name.

Author: sayakpaul

.github/workflows/nightly_tests.yml

@@ -354,7 +354,7 @@ jobs:
       max-parallel: 2
       matrix: 
         config:
-          - backend: "bitandbytes"
+          - backend: "bitsandbytes"
             test_location: "bnb"
     runs-on:
       group: aws-g6e-xlarge-plus