[AutoPR] TODO migrate to pydantic 2.0, and use a nested sel ...

[github-actions]

TODO migrate to pydantic 2.0, and use a nested self-referential Union like this:

AutoPR/autopr/models/executable.py

Lines 30 to 40 in dd6cdd8

	# supports jinja2 templates like `{{ pull_request.title }}`
	TemplateString = str
	# supports jinja2 templates in nested dicts/lists
	TemplateObject = Union[TemplateString, dict[str, Any], list[Any]]
	# TODO migrate to pydantic 2.0, and use a nested self-referential Union like this:
	# TemplateObject = Union[TemplateString, dict[str, "TemplateObject"], list["TemplateObject"]]
	class ContextDict(dict[ContextVarName, Any]):
	def get_path(self, path: ContextVarPath) -> Any:

To resolve this TODO, you can start by updating the code to use the latest version of pydantic (2.0). Then, you can implement a nested self-referential Union, following the example provided.