✨ Use pwdlib with Argon2 by default, adding logic (and tests) to autoupdate old passwords using Bcrypt (#2104)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

backend/app/crud.py

@@ -41,8 +41,14 @@ def authenticate(*, session: Session, email: str, password: str) -> User | None:
     db_user = get_user_by_email(session=session, email=email)
     if not db_user:
         return None
-    if not verify_password(password, db_user.hashed_password):
+    verified, updated_password_hash = verify_password(password, db_user.hashed_password)
+    if not verified:
         return None
+    if updated_password_hash:
+        db_user.hashed_password = updated_password_hash
+        session.add(db_user)
+        session.commit()
+        session.refresh(db_user)
     return db_user