feat: bump Go to 1.20 to resolve MacOS DNS resolution issues (#342)

* feat: bump the go version

Bumping the go version ensures that MacOS DNS is resolved correctly as
per https://go-review.googlesource.com/c/go/+/446178.

Resolves: #341

* bump go version in /tools and in readme

---------

Co-authored-by: Pavel Boldyrev <627562+bpg@users.noreply.github.com>

Makefile

@@ -2,7 +2,7 @@ GOFMT_FILES?=$$(find . -name '*.go' | grep -v vendor)
 NAME=terraform-provider-proxmox
 TARGETS=darwin linux windows
 TERRAFORM_PLUGIN_EXTENSION=
-VERSION=0.19.1# x-release-please-version
+VERSION=0.19.2# x-release-please-version
 
 ifeq ($(OS),Windows_NT)
 	TERRAFORM_PLATFORM=windows_amd64

README.md

@@ -25,7 +25,7 @@ other enhancements.
 ## Requirements
 
 - [Terraform](https://www.terraform.io/downloads.html) 1.2+
-- [Go](https://golang.org/doc/install) 1.19+ (to build the provider plugin)
+- [Go](https://golang.org/doc/install) 1.20+ (to build the provider plugin)
 - [GoReleaser](https://goreleaser.com/install/) v1.15+ (to build the provider plugin)
 
 ## Table of Contents

go.mod

@@ -1,6 +1,6 @@
 module github.com/bpg/terraform-provider-proxmox
 
-go 1.19
+go 1.20
 
 require (
 	github.com/google/go-querystring v1.1.0

tools/go.mod

@@ -1,6 +1,6 @@
 module github.com/golang-templates/seed/build
 
-go 1.19
+go 1.20
 
 require (
 	github.com/golangci/golangci-lint v1.52.2