fix(frigate-health-checker): use union type syntax for isinstance check

Author: web-flow

apps/frigate-health-checker/src/frigate_health_checker/health_checker.py

@@ -138,7 +138,7 @@ def _get_camera_count(self, stats: dict[str, object]) -> int:
         for camera_stats in cameras.values():
             if isinstance(camera_stats, dict):
                 fps = camera_stats.get("camera_fps", 0)
-                if isinstance(fps, (int, float)) and fps >= 1:
+                if isinstance(fps, int | float) and fps >= 1:
                     count += 1
         return count