Update CI.yml

Author: maximiliani

.github/workflows/CI.yml

@@ -121,7 +121,7 @@ jobs:
       matrix:
         operating-system: [ubuntu-latest, macOS-latest, windows-latest]
         # Use both LTS releases and latest one for tests
-        jdk: [ 11, 16, 17 ]
+        jdk: [ 11, 17, 18 ]
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2