build: update to go1.20.5 (#17451)

Go released a security update to fix build-time code injection and execution via
CGO. This doesn't impact already-released versions of Nomad, just the build
toolchain, so we won't be releasing a Nomad security update to go with it.

.circleci/config.yml

@@ -454,7 +454,7 @@ executors:
   go:
     working_directory: /go/src/github.com/hashicorp/nomad
     docker:
-      - image: docker.mirror.hashicorp.services/golang:1.20.4
+      - image: docker.mirror.hashicorp.services/golang:1.20.5
     resource_class: medium
     environment:
       <<: *common_envs
@@ -467,7 +467,7 @@ executors:
       resource_class: large
     environment: &machine_env
       <<: *common_envs
-      GOLANG_VERSION: 1.20.4
+      GOLANG_VERSION: 1.20.5
 
   go-macos:
     working_directory: ~/go/src/github.com/hashicorp/nomad
@@ -476,7 +476,7 @@ executors:
     environment:
       <<: *common_envs
       GOPATH: /Users/distiller/go
-      GOLANG_VERSION: 1.20.4
+      GOLANG_VERSION: 1.20.5
 
   go-windows:
     machine:
@@ -488,7 +488,7 @@ executors:
       GOPATH: c:\gopath
       GOBIN: c:\gopath\bin
       GOTESTSUM_PATH: c:\tmp\test-reports
-      GOLANG_VERSION: 1.20.4
+      GOLANG_VERSION: 1.20.5
       GOTESTSUM_VERSION: 1.7.0
       VAULT_VERSION: 1.4.1
 

.go-version

@@ -1 +1 @@
-1.20.4
+1.20.5

contributing/README.md

@@ -30,7 +30,7 @@ A development environment is supplied via Vagrant to make getting started easier
 
 Developing without Vagrant
 ---
-1. Install [Go 1.20.4+](https://golang.org/) *(Note: `gcc-go` is not supported)*
+1. Install [Go 1.20.5+](https://golang.org/) *(Note: `gcc-go` is not supported)*
 1. Clone this repo
    ```sh
    $ git clone https://github.com/hashicorp/nomad.git

scripts/linux-priv-go.sh

@@ -21,7 +21,7 @@ case $(arch) in
 esac
 
 function install_go() {
-	local go_version="1.20.4"
+	local go_version="1.20.5"
 	local download="https://storage.googleapis.com/golang/go${go_version}.linux-${ARCH}.tar.gz"
 
 	if go version 2>&1 | grep -q "${go_version}"; then

scripts/release/mac-remote-build

@@ -56,7 +56,7 @@ REPO_PATH="${TMP_WORKSPACE}/gopath/src/github.com/hashicorp/nomad"
 mkdir -p "${TMP_WORKSPACE}/tmp"
 
 install_go() {
-  local go_version="1.20.4"
+  local go_version="1.20.5"
   local download=
 
   download="https://storage.googleapis.com/golang/go${go_version}.darwin-amd64.tar.gz"