chore: test on all Julia versions

Author: pfitzseb

.github/workflows/CI.yml

@@ -27,8 +27,9 @@ jobs:
           - '1.4'
           - '1.5'
           - '1.6'
-          # - '1.7' # TODO: uncomment this line once Julia 1.8 is released
-          - '~1.8.0-rc1' # TODO: delete this line once Julia 1.8 is released
+          - '1.7'
+          - '1.8'
+          - '1.9'
           - '1' # automatically expands to the latest stable 1.x release
           - 'nightly'
         os: