build: update toolchain to Go 1.25.5

.changelog/27186.txt

@@ -0,0 +1,3 @@
+```release-note:security
+build: Updated toolchain to Go 1.25.5
+```

.go-version

@@ -1 +1 @@
-1.25.3
+1.25.5

contributing/README.md

@@ -52,7 +52,7 @@ A development environment is supplied via Vagrant to make getting started easier
 
 Developing without Vagrant
 ---
-1. Install [Go 1.25.3+](https://golang.org/) *(Note: `gcc-go` is not supported)*
+1. Install [Go 1.25.5+](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

@@ -15,13 +15,13 @@ esac
 
 # Minimal effort to support amd64 and arm64 installs.
 ARCH=""
-case $(arch) in
+case $(arch) in 
     x86_64) ARCH="amd64" ;;
     aarch64) ARCH="arm64" ;;
 esac
 
 function install_go() {
-	local go_version="1.25.3"
+	local go_version="1.25.5"
 	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="1.25.3"
+  local go_version="1.25.5"
   local download=
 
   download="https://storage.googleapis.com/golang/go${go_version}.darwin-amd64.tar.gz"