update to go1.21.9

go1.21.9 (released 2024-04-03) includes a security fix to the net/http
package, as well as bug fixes to the linker, and the go/types and
net/http packages. See the Go 1.21.9 milestone on our issue tracker for
details.

- https://github.com/golang/go/issues?q=milestone%3AGo1.21.9+label%3ACherryPickApproved
- full diff: https://github.com/golang/go/compare/go1.21.8...go1.21.9

**- Description for the changelog**

```markdown changelog
Update Go runtime to 1.21.9
```

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

.github/workflows/test.yml

@@ -64,7 +64,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.21.8
+          go-version: 1.21.9
       -
         name: Test
         run: |

Dockerfile

@@ -4,7 +4,7 @@ ARG BASE_VARIANT=alpine
 ARG ALPINE_VERSION=3.18
 ARG BASE_DEBIAN_DISTRO=bookworm
 
-ARG GO_VERSION=1.21.8
+ARG GO_VERSION=1.21.9
 ARG XX_VERSION=1.4.0
 ARG GOVERSIONINFO_VERSION=v1.3.0
 ARG GOTESTSUM_VERSION=v1.10.0

docker-bake.hcl

@@ -1,5 +1,5 @@
 variable "GO_VERSION" {
-    default = "1.21.8"
+    default = "1.21.9"
 }
 variable "VERSION" {
     default = ""

dockerfiles/Dockerfile.dev

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.21.8
+ARG GO_VERSION=1.21.9
 ARG ALPINE_VERSION=3.18
 
 ARG BUILDX_VERSION=0.12.1

dockerfiles/Dockerfile.lint

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.21.8
+ARG GO_VERSION=1.21.9
 ARG ALPINE_VERSION=3.18
 ARG GOLANGCI_LINT_VERSION=v1.55.2
 

dockerfiles/Dockerfile.vendor

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.21.8
+ARG GO_VERSION=1.21.9
 ARG ALPINE_VERSION=3.18
 ARG MODOUTDATED_VERSION=v0.8.0
 

e2e/testdata/Dockerfile.gencerts

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.21.8
+ARG GO_VERSION=1.21.9
 
 FROM golang:${GO_VERSION}-alpine AS generated
 ENV GOTOOLCHAIN=local