Update SlowAPI and remove hacky HTTP response

app.py

@@ -510,9 +510,9 @@ def sanitize_filename(filename: str, base: Path = Path.cwd().resolve()) -> Path:
 async def static(request, fn):
     try:
         path = sanitize_filename(fn, Path("static/").resolve())
-        return (
-            HTTPResponse(request, "", content_type="application/octet-stream")
-            + path.read_bytes()
+
+        return HTTPResponse(
+            request, path.read_bytes(), content_type="application/octet-stream"
         )
     except Exception:
         return HTTPResponse(request, "404 File Not Found", status=404)