fix typo in min. HA version

Author: mampfes

hacs.json

@@ -1,5 +1,5 @@
 {
   "name": "DWD Pollenflug",
   "render_readme": true,
-  "homeassistant": "2023.3.0"
+  "homeassistant": "2023.2.0"
 }