Add deprecation warning for CodeQL 2.16.5 and earlier

Author: henrymercer

lib/codeql.js

@@ -285,17 +285,17 @@ const CODEQL_MINIMUM_VERSION = "2.15.5";
 /**
  * This version will shortly become the oldest version of CodeQL that the Action will run with.
  */
-const CODEQL_NEXT_MINIMUM_VERSION = "2.15.5";
+const CODEQL_NEXT_MINIMUM_VERSION = "2.16.6";
 
 /**
  * This is the version of GHES that was most recently deprecated.
  */
-const GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.11";
+const GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.12";
 
 /**
  * This is the deprecation date for the version of GHES that was most recently deprecated.
  */
-const GHES_MOST_RECENT_DEPRECATION_DATE = "2024-12-19";
+const GHES_MOST_RECENT_DEPRECATION_DATE = "2025-04-03";
 
 /** The CLI verbosity level to use for extraction in debug mode. */
 const EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";