Dependencies and python 3.9

projectorpi_web/app.py

@@ -4,6 +4,7 @@ from projectorpi.cli import ProjectorSerial, ExtronSerial
 from pydantic import BaseModel
 from time import sleep
 from http import HTTPStatus
+from typing import Optional
 import sentry_sdk
 
 sentry_sdk.init(
@@ -22,7 +23,7 @@ projector = ProjectorSerial()
 
 class Response(BaseModel):
     status: str
-    error: str | None = None
+    error: Optional[str] = None
 
 
 @app.get("/")