✨ Export OAuth2PasswordRequestFormStrict from security (#1462)

* Update __init__.py

Fixes an import error:     

from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestFormStrict
ImportError: cannot import name 'OAuth2PasswordRequestFormStrict'

* Simplify import of OAuth2PasswordRequestFormStrict

* Simplify import of OAuth2PasswordRequestFormStrict

fastapi/security/__init__.py

@@ -11,6 +11,7 @@ from .oauth2 import (
     OAuth2AuthorizationCodeBearer,
     OAuth2PasswordBearer,
     OAuth2PasswordRequestForm,
+    OAuth2PasswordRequestFormStrict,
     SecurityScopes,
 )
 from .open_id_connect_url import OpenIdConnect

tests/test_security_oauth2.py

@@ -1,7 +1,6 @@
 import pytest
 from fastapi import Depends, FastAPI, Security
-from fastapi.security import OAuth2
+from fastapi.security import OAuth2, OAuth2PasswordRequestFormStrict
-from fastapi.security.oauth2 import OAuth2PasswordRequestFormStrict
 from fastapi.testclient import TestClient
 from pydantic import BaseModel
 

tests/test_security_oauth2_optional.py

@@ -2,8 +2,7 @@ from typing import Optional
 
 import pytest
 from fastapi import Depends, FastAPI, Security
-from fastapi.security import OAuth2
+from fastapi.security import OAuth2, OAuth2PasswordRequestFormStrict
-from fastapi.security.oauth2 import OAuth2PasswordRequestFormStrict
 from fastapi.testclient import TestClient
 from pydantic import BaseModel