Use Rust 2024 in scaffold test fixture

Signed-off-by: lucarlig <luca.carlig@ibm.com>

Author: lucarlig

tests/test_plugin_catalog.py

@@ -410,7 +410,7 @@ def test_plugin_scaffold_generator_renders_standalone_cpex_imports(self) -> None
                     resolver = "2"
 
                     [workspace.package]
-                    edition = "2021"
+                    edition = "2024"
                     authors = ["Test"]
                     license = "Apache-2.0"
                     repository = "https://example.invalid"