upgrade to go 1.20

.github/workflows/build.yml

       - name: "setup go"
         uses: "actions/setup-go@v3"
         with:
-          go-version: "1.19"
+          go-version: "1.20"
       - name: "install python3-pytest"
         run: "sudo apt install -y python3-pytest"
       - name: "make install"

Dockerfile

 ## build ergo binary
-FROM golang:1.19-alpine AS build-env
+FROM golang:1.20-alpine AS build-env
 
 RUN apk add -U --force-refresh --no-cache --purge --clean-protected -l -u make git
 

go.mod

 module github.com/ergochat/ergo
 
-go 1.19
+go 1.20
 
 require (
 	code.cloudfoundry.org/bytefmt v0.0.0-20200131002437-cf55d5288a48