Update golang:1.23-alpine Docker digest to 9a31ef0 (#102)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1@sha256:865e5dd094beca432e8c0a1d5e1c465db5f998dca4e439981029b3b81fb39ed5
-FROM golang:1.23-alpine@sha256:c694a4d291a13a9f9d94933395673494fc2cc9d4777b85df3a7e70b3492d3574 AS build-env
+FROM golang:1.23-alpine@sha256:9a31ef0803e6afdf564edc8ba4b4e17caed22a0b1ecd2c55e3c8fdd8d8f68f98 AS build-env
 RUN mkdir -p /go/src/confluence-gardner
 
 # Copy the module files first and then download the dependencies. If this