fix(factory): unwrap config to not end up with tomlkit instances

Author: mkniewallner

src/poetry/core/factory.py

@@ -56,14 +56,18 @@ def create_poetry(
             raise RuntimeError("The Poetry configuration is invalid:\n" + message)
 
         # Load package
+        # Convert `tomlkit` attributes to bare Python object representations.
+        # Cast can be removed once tomlkit is bumped to > 0.11.4 (PR: https://github.com/sdispater/tomlkit/pull/229).
+        unwrapped_local_config = cast("dict[str, Any]", local_config.unwrap())
+
         name = cast(str, local_config["name"])
         version = cast(str, local_config["version"])
         package = self.get_package(name, version)
         package = self.configure_package(
-            package, local_config, poetry_file.parent, with_groups=with_groups
+            package, unwrapped_local_config, poetry_file.parent, with_groups=with_groups
         )
 
-        return Poetry(poetry_file, local_config, package)
+        return Poetry(poetry_file, unwrapped_local_config, package)
 
     @classmethod
     def get_package(cls, name: str, version: str) -> ProjectPackage: