Proposing an upgrade on upstream from go1.13 to 1.19

Signed-off-by: Antonette Caldwell <pullmana8@gmail.com>

Author: acald-creator

upstream/Dockerfile

@@ -1,4 +1,6 @@
-FROM golang:1.13.5 as bd
+# syntax=docker/dockerfile:1
+
+FROM golang:1.19.1 as bd
 WORKDIR /github.com/layer5io/wasm-upstream
 ADD . .
 RUN GOPROXY=direct GOSUMDB=off go build -a -o /upstream .

upstream/go.mod

@@ -0,0 +1,3 @@
+module github.com/layer5io/wasm-filters/upstream
+
+go 1.19

upstream/main.go

@@ -2,15 +2,15 @@ package main
 
 import (
 "fmt"
-"io/ioutil"
+"io"
 "net/http"
 )
 
 var gldata = ""
 
 func store(w http.ResponseWriter, req *http.Request) {
 defer req.Body.Close()
-data, err := ioutil.ReadAll(req.Body)
+data, err := io.ReadAll(req.Body)
 if err != nil {
 return
 }