Bump CLI version from v2.15.2 to v2.15.3 for integration tests (#3083)

Author: github-actions[bot]

extensions/ql-vscode/supported_cli_versions.json

@@ -1,5 +1,5 @@
 [
-  "v2.15.2",
+  "v2.15.3",
   "v2.14.6",
   "v2.13.5",
   "v2.12.7",