Update golang:latest Docker digest to 39d9e7d (#172)

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

Author: renovate[bot]

Dockerfile

@@ -1,6 +1,6 @@
 
 # Build a go app into a minimal docker image with timezone support and SSL cert chains.
-FROM golang:latest@sha256:30baaea08c5d1e858329c50f29fe381e9b7d7bced11a0f5f1f69a1504cdfbf5e as builder
+FROM golang:latest@sha256:39d9e7d9c5d9c9e4baf0d8fff579f06d5032c0f4425cdec9e86732e8e4e374dc as builder
 ARG TARGETOS
 ARG TARGETARCH
 ARG BUILD_FLAGS=""