Bump CLI version from v2.17.6 to v2.18.0 for integration tests (#3661)

Co-authored-by: github-actions[bot] <github-actions@github.com>

Author: github-actions[bot]

extensions/ql-vscode/supported_cli_versions.json

@@ -1,4 +1,5 @@
 [
+  "v2.18.0",
   "v2.17.6",
   "v2.16.6",
   "v2.15.5",