ipv6_only: switch to network enable_ipv4: false (renamed in esphome#19750)

common/ipv6_only.yaml

@@ -4,16 +4,17 @@
 #     common: !include common/common.yaml
 #     ipv6_only: !include common/ipv6_only.yaml
 external_components:
-  # wifi ipv6_only (esphome/esphome#19750), drop once merged
+  # network enable_ipv4 (esphome/esphome#19750), drop once merged
   - source: github://pr#19750
     components: [const, network, wifi]
 
 wifi:
-  ipv6_only: true
   networks:
     - id: !extend wifi_iot
       ssid: !secret wifi_ssid_ipv6
       password: !secret wifi_password_ipv6
 
 network:
+  enable_ipv6: true
+  enable_ipv4: false
   min_ipv6_addr_count: 1