update cesm tag in ci test (#16)

Author: alperaltuntas

.github/workflows/ci-tests.yml

@@ -29,7 +29,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: alperaltuntas/CESM
-          ref: cesm3_0_beta03_gui
+          ref: cesm3_0_beta06_gui
           path: CESM
           #submodules: recursive