ifc2ca, bcf, opencdeserver - add Python 3.9 support

Was breaking due to `|` operator used in annotations instead of `Union`

src/opencdeserver/api/app/models/foundation_other.py

@@ -1,3 +1,4 @@
+from __future__ import annotations
 from pydantic import BaseModel
 
 

src/opencdeserver/api/app/models/other.py

@@ -1,3 +1,4 @@
+from __future__ import annotations
 from pydantic import BaseModel
 from typing import List
 

src/opencdeserver/api/app/models/request.py

@@ -1,3 +1,4 @@
+from __future__ import annotations
 from pydantic import BaseModel
 
 

src/opencdeserver/api/app/security/secure.py

@@ -1,3 +1,4 @@
+from __future__ import annotations
 from fastapi import Depends, HTTPException, status, Security
 from fastapi.security import OAuth2AuthorizationCodeBearer, SecurityScopes