Bump alpine from 20230901 to 20231219 in /images

Bumps alpine from 20230901 to 20231219.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

images/Dockerfile

@@ -25,7 +25,7 @@ RUN export GOOS=$(xx-info os) &&\
     export ARCH=$(xx-info arch) &&\
     make build
 
-FROM alpine:20230901
+FROM alpine:20231219
 RUN apk update && apk upgrade
 RUN apk add --no-cache iproute2 net-tools ca-certificates iptables strongswan iptables-legacy && update-ca-certificates
 RUN apk add wireguard-tools --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/community