Remove ChristianKuehnel from codeowners (#42335)

CODEOWNERS

@@ -258,7 +258,7 @@ homeassistant/components/met/* @danielhiversen @thimic
 homeassistant/components/meteo_france/* @hacf-fr @oncleben31 @Quentame
 homeassistant/components/meteoalarm/* @rolfberkenbosch
 homeassistant/components/metoffice/* @MrHarcombe
-homeassistant/components/miflora/* @danielhiversen @ChristianKuehnel @basnijholt
+homeassistant/components/miflora/* @danielhiversen @basnijholt
 homeassistant/components/mikrotik/* @engrbm87
 homeassistant/components/mill/* @danielhiversen
 homeassistant/components/min_max/* @fabaff
@@ -327,7 +327,6 @@ homeassistant/components/pi4ioe5v9xxxx/* @antonverburg
 homeassistant/components/pi_hole/* @fabaff @johnluetke @shenxn
 homeassistant/components/pilight/* @trekky12
 homeassistant/components/plaato/* @JohNan
-homeassistant/components/plant/* @ChristianKuehnel
 homeassistant/components/plex/* @jjlawren
 homeassistant/components/plugwise/* @CoMPaTech @bouwew
 homeassistant/components/plum_lightpad/* @ColinHarrington @prystupa

homeassistant/components/miflora/manifest.json

@@ -3,5 +3,5 @@
   "name": "Mi Flora",
   "documentation": "https://www.home-assistant.io/integrations/miflora",
   "requirements": ["bluepy==1.3.0", "miflora==0.7.0"],
-  "codeowners": ["@danielhiversen", "@ChristianKuehnel", "@basnijholt"]
+  "codeowners": ["@danielhiversen", "@basnijholt"]
 }

homeassistant/components/plant/manifest.json

@@ -3,6 +3,6 @@
   "name": "Plant Monitor",
   "documentation": "https://www.home-assistant.io/integrations/plant",
   "after_dependencies": ["recorder"],
-  "codeowners": ["@ChristianKuehnel"],
+  "codeowners": [],
   "quality_scale": "internal"
 }