Bump PySwitchbot to 0.20.3 (#81938)

changelog: https://github.com/Danielhiversen/pySwitchbot/compare/0.20.2...0.20.3

releases the connection sooner to reduce the risk
of running out of connection slots on the ble adapter

homeassistant/components/switchbot/manifest.json

@@ -2,7 +2,7 @@
   "domain": "switchbot",
   "name": "SwitchBot",
   "documentation": "https://www.home-assistant.io/integrations/switchbot",
-  "requirements": ["PySwitchbot==0.20.2"],
+  "requirements": ["PySwitchbot==0.20.3"],
   "config_flow": true,
   "dependencies": ["bluetooth"],
   "codeowners": [