update CI versions to latest LTS (1.7) and release (1.9)

Author: berquist

.github/workflows/CI.yml

@@ -19,8 +19,8 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - "1.2"
           - "1.7"
+          - "1.9"
           - "nightly"
         os:
           - ubuntu-latest