Update ci.yml

Author: sl-solution

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
           - '1' # automatically expands to the latest stable 1.x release of Julia
           # - 'nightly'
         os:
-          # - ubuntu-latest
+          - ubuntu-latest
         arch:
           - x64
         # include: