Update alpine Docker tag to v3.23

Author: renovate[bot]

Dockerfile

@@ -1,7 +1,7 @@
 FROM grafana/xk6:0.12.1 as builder
 RUN xk6 build  --with  github.com/grafana/xk6-redis  --with github.com/grafana/xk6-output-prometheus-remote
 
-FROM alpine:3.20 as release
+FROM alpine:3.23 as release
 RUN adduser -D -u 12345 -g 12345 k6
 COPY --from=builder /xk6/k6 /usr/bin/k6
 USER k6