Update docker.io/golang Docker tag to v1.23

Dockerfile

-FROM docker.io/golang:1.22 as builder
+FROM docker.io/golang:1.23 as builder
 COPY . /data
 RUN apk --no-cache add build-base git
 RUN CGO_ENABLED=0 go install go.k6.io/xk6/cmd/xk6@latest && xk6 build --with github.com/szkiba/xk6-dashboard --output /tmp/k6