Update dependency attrs to v21.4.0

This MR contains the following updates:

Package	Update	Change
attrs (source, changelog)	minor	==21.2.0 -> ==21.4.0

---

Configuration

Schedule: At any time (no schedule defined).

Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, click this checkbox.

---

This MR has been generated by Renovate Bot.

areas/auth/auth.py

-from flask import jsonify
+from flask import jsonify, request
 from flask_jwt_extended import create_access_token
 from flask_cors import cross_origin
 from datetime import timedelta
 
 from areas import api_v1
 from config import *
-from helpers import HydraOauth
+from helpers import HydraOauth, BadRequest
 
 
 @api_v1.route("/login", methods=["POST"])
@@ -18,7 +18,11 @@ def login():
 @api_v1.route("/hydra/callback")
 @cross_origin()
 def hydra_callback():
-    token = HydraOauth.get_token()
+    state = request.args.get("state")
+    if state == None:
+        raise BadRequest("Missing state query param")
+
+    token = HydraOauth.get_token(state)
     access_token = create_access_token(
         identity=token, expires_delta=timedelta(days=365)
     )