Fix supported CLI versions file

Author: koesie10

extensions/ql-vscode/supported_cli_versions.json

@@ -1,8 +1,6 @@
 [
   "v2.20.2",
-  "v2.20.1",
   "v2.19.4",
-  "v2.19.3",
   "v2.18.4",
   "nightly"
 ]