docker: build Alpine based image using golang:1.22-alpine3.20

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

Dockerfile.alpine

@@ -1,4 +1,4 @@
-FROM golang:1.22-alpine3.19 AS builder
+FROM golang:1.22-alpine3.20 AS builder
 
 ENV GOFLAGS="-mod=readonly"