Update Go version

Update build/test to use Go 1.21.

Signed-off-by: Michal Biesek <michalbiesek@gmail.com>

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     # Whenever the Go version is updated here, .promu.yml
     # should also be updated.
     container:
-      image: quay.io/prometheus/golang-builder:1.20-base
+      image: quay.io/prometheus/golang-builder:1.21-base
     steps:
       - uses: actions/checkout@v3
       - uses: prometheus/promci@v0.1.0
@@ -32,7 +32,7 @@ jobs:
     # Whenever the Go version is updated here, .promu.yml
     # should also be updated.
     container:
-      image: quay.io/prometheus/golang-builder:1.20-base
+      image: quay.io/prometheus/golang-builder:1.21-base
 
     steps:
       - uses: actions/checkout@v3
@@ -55,7 +55,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: '>=1.20 <1.21'
+          go-version: '>=1.21 <1.22'
       - run: |
           $TestTargets = go list ./... | Where-Object { $_ -NotMatch "(github.com/prometheus/prometheus/discovery.*|github.com/prometheus/prometheus/config|github.com/prometheus/prometheus/web)"}
           go test $TestTargets -vet=off -v
@@ -66,7 +66,7 @@ jobs:
     runs-on: ubuntu-latest
     # The go verson in this image should be N-1 wrt test_go.
     container:
-      image: quay.io/prometheus/golang-builder:1.19-base
+      image: quay.io/prometheus/golang-builder:1.20-base
     steps:
       - uses: actions/checkout@v3
       - run: make build
@@ -79,7 +79,7 @@ jobs:
     # Whenever the Go version is updated here, .promu.yml
     # should also be updated.
     container:
-      image: quay.io/prometheus/golang-builder:1.19-base
+      image: quay.io/prometheus/golang-builder:1.20-base
     steps:
       - uses: actions/checkout@v3
       - run: go install ./cmd/promtool/.

.github/workflows/codeql-analysis.yml

@@ -27,7 +27,7 @@ jobs:
         uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: '>=1.20 <1.21'
+          go-version: '>=1.21 <1.22'
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v2

.promu.yml

@@ -1,7 +1,7 @@
 go:
     # Whenever the Go version is updated here,
     # .circle/config.yml should also be updated.
-    version: 1.20
+    version: 1.21
 repository:
     path: github.com/prometheus/prometheus
 build:

go.mod

@@ -1,6 +1,6 @@
 module github.com/prometheus/prometheus
 
-go 1.19
+go 1.20
 
 require (
 	github.com/Azure/azure-sdk-for-go v65.0.0+incompatible