remove nightly from CI matrix

remove nightly from CI matrix until JuliaLang/julia#59956 is resolved

Author: tanmaykm

.github/workflows/CI.yml

@@ -29,7 +29,6 @@ jobs:
           - "1.6"
           - "1.10"
           - "1"
-          - "nightly"
         os:
           - ubuntu-latest
         include: