Update golang:latest Docker digest to 6ca9eb0 (#211)

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@sha256:516827db2015144cf91e042d1b6a3aca574d013a4705a6fdc4330444d47169d5 as builder
+FROM golang:latest@sha256:6ca9eb0b32a4bd4e8c98a4a2edf2d7c96f3ea6db6eb4fc254eef6c067cf73bb4 as builder
 ARG TARGETOS
 ARG TARGETARCH
 ARG BUILD_FLAGS=""