use annotations from future (for compatibility)

Author: mahenzon

docs/python_snippets/view_dependencies/main_example.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from fastapi import Depends, Header
 from pydantic import BaseModel
 from sqlalchemy.engine import make_url

examples/api_for_sqlalchemy/models/schemas/user.py

@@ -1,4 +1,5 @@
 """User schemas module."""
+from __future__ import annotations
 
 from datetime import datetime
 from typing import TYPE_CHECKING, List, Optional

examples/api_for_sqlalchemy/models/user.py

@@ -1,5 +1,5 @@
 """User model."""
-
+from __future__ import annotations
 
 from sqlalchemy import Column, Integer, String
 from sqlalchemy.orm import relationship

tests/fixtures/entities.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from typing import Awaitable, Callable, List
 
 from pytest import fixture  # noqa