Add codegen package to package version level calculation

Signed-off-by: schapper <schapper@amazon.com>

Author: vcschapp

.github/workflows/scripts/package-versions.py

@@ -63,7 +63,7 @@ def level(package: str) -> int:
             return 0
         elif package in ["overture-schema-core"]:
             return 1
-        elif re.fullmatch(r'overture-schema-.*-theme', package) or package in ["overture-schema", "overture-schema-cli", "overture-schema-annex"]:
+        elif re.fullmatch(r'overture-schema-.*-theme', package) or package in ["overture-schema", "overture-schema-cli", "overture-schema-codegen", "overture-schema-annex"]:
             return 2
         else:
             raise ValueError(f"Unknown package for level computation: {package}")