Update golang:latest Docker digest to 20a022e (#182)

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@sha256:764d7e0ce1df1e4a1bddc6d1def5f3516fdc045c5fad88e61f67fdbd1857282f as builder
+FROM golang:latest@sha256:20a022e5112a144aa7b7aeb3f22ebf2cdaefcc4aac0d64e8deeee8cdc18b9c0f as builder
 ARG TARGETOS
 ARG TARGETARCH
 ARG BUILD_FLAGS=""