Loosen caldav and icalendar version requirements to >= constraints

custom_components/room_cal_ha/manifest.json

@@ -5,7 +5,7 @@
   "config_flow": true,
   "documentation": "https://github.com/room-cal-ha/room_cal_ha",
   "issue_tracker": "https://github.com/room-cal-ha/room_cal_ha/issues",
-  "requirements": ["caldav==1.3.9", "icalendar==5.0.12"],
+  "requirements": ["caldav>=3.2.1", "icalendar>=7.1.3"],
   "dependencies": [],
   "codeowners": [],
   "iot_class": "cloud_polling"