Update quality scale to silver for NRGkick integration (#43727)

Author: andijakl

source/_integrations/nrgkick.markdown

@@ -4,7 +4,7 @@ description: Integrate the NRGkick Gen2 mobile EV charger using the local REST J
 ha_category:
   - Energy
 ha_iot_class: Local Polling
-ha_quality_scale: bronze
+ha_quality_scale: silver
 ha_release: 2026.2
 ha_codeowners:
   - '@andijakl'