Bump CLI version from v2.21.0 to v2.21.1 for integration tests

Author: github-actions[bot]

extensions/ql-vscode/supported_cli_versions.json

@@ -1,5 +1,5 @@
 [
-  "v2.21.0",
+  "v2.21.1",
   "v2.20.7",
   "v2.19.4",
   "v2.18.4",