Update Go to 1.23

* Update Go build to 1.23.
* Update minimum Go version to 1.22.

Signed-off-by: SuperQ <superq@gmail.com>

.circleci/config.yml

@@ -2,7 +2,7 @@
 version: 2.1
 orbs:
   prometheus: prometheus/prometheus@0.17.1
-  go: circleci/go@1.11.0
+  go: circleci/go@1.12.0
 jobs:
   test_frontend:
     # We need to use a machine executor because the front-end validation runs
@@ -18,7 +18,7 @@ jobs:
           command: sudo rm -rf /usr/local/go
       # Whenever the Go version is updated here, .promu.yml should also be updated.
       - go/install:
-          version: "1.22.6"
+          version: "1.23.2"
       - run:
           name: Remove generated code
           command: make clean

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
     # Whenever the Go version is updated here, .promu.yml
     # should also be updated.
     container:
-      image: quay.io/prometheus/golang-builder:1.22-base
+      image: quay.io/prometheus/golang-builder:1.23-base
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
       - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0

.github/workflows/mixin.yml

@@ -14,7 +14,7 @@ jobs:
       - name: install Go
         uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
         with:
-          go-version: 1.22.x
+          go-version: 1.23.x
       # pin the mixtool version until https://github.com/monitoring-mixins/mixtool/issues/135 is merged.
       - run: go install github.com/monitoring-mixins/mixtool/cmd/mixtool@2282201396b69055bb0f92f187049027a16d2130
       - run: go install github.com/google/go-jsonnet/cmd/jsonnetfmt@latest

.promu.yml

@@ -1,7 +1,7 @@
 go:
     # Whenever the Go version is updated here,
     # .circle/config.yml should also be updated.
-    version: 1.22
+    version: 1.23
 repository:
     path: github.com/prometheus/alertmanager
 build:

go.mod

@@ -1,8 +1,6 @@
 module github.com/prometheus/alertmanager
 
-go 1.21.8
-
-toolchain go1.22.4
+go 1.22
 
 require (
 	github.com/KimMachineGun/automemlimit v0.6.1