Use alpine 3.21 for armhf and armv7 (#758)

Author: Koenkk

common/build.yaml

@@ -2,6 +2,5 @@ build_from:
   aarch64: ghcr.io/home-assistant/aarch64-base:3.21
   amd64: ghcr.io/home-assistant/amd64-base:3.21
   i386: ghcr.io/home-assistant/i386-base:3.21
-  # See https://github.com/zigbee2mqtt/hassio-zigbee2mqtt/pull/652#issuecomment-2448119395 why 3.18 is used
-  armhf: ghcr.io/home-assistant/armhf-base:3.18
-  armv7: ghcr.io/home-assistant/armv7-base:3.18
+  armhf: ghcr.io/home-assistant/armhf-base:3.21
+  armv7: ghcr.io/home-assistant/armv7-base:3.21