build: update build system to Go 1.20.3

Dockerfile

@@ -4,7 +4,7 @@
 # /make/builder.Dockerfile
 # /.github/workflows/main.yml
 # /.github/workflows/release.yml
-FROM golang:1.19.7-alpine as builder
+FROM golang:1.20.3-alpine as builder
 
 # Force Go to use the cgo based DNS resolver. This is required to ensure DNS
 # queries required to connect to linked containers succeed.