Update golang:latest Docker digest to 51a6466 (#60)

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

Dockerfile

@@ -1,6 +1,6 @@
 
 # Build a go app into a minimal docker image with timezone support and SSL cert chains.
-FROM golang:latest@sha256:9820aca42262f58451f006de3213055974b36f24b31508c1baa73c967fcecb99 as builder
+FROM golang:latest@sha256:51a6466e8dbf3e00e422eb0f7a97ac450b2d57b33617bbe8d2ee0bddcd9d0d37 as builder
 ARG TARGETOS
 ARG TARGETARCH
 ARG BUILD_FLAGS=""