feat: add support for Kubernetes v1.21.12 (#4882)

See https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.21.md#changelog-since-v12111

pkg/api/common/versions.go

@@ -290,7 +290,8 @@ var AllKubernetesSupportedVersions = map[string]bool{
 	"1.21.8":         false,
 	"1.21.9":         false,
 	"1.21.10":        false,
-	"1.21.11":        true,
+	"1.21.11":        false,
+	"1.21.12":        true,
 	"1.22.0-alpha.1": false,
 	"1.22.0-alpha.2": false,
 	"1.22.0-alpha.3": false,

vhd/packer/configure-windows-vhd.ps1

@@ -123,7 +123,7 @@ function Get-FilesToCacheOnVHD {
         "c:\akse-cache\win-k8s\"      = @(
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.19.16/windowszip/v1.19.16-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.20.15/windowszip/v1.20.15-1int.zip",
-            "https://kubernetesartifacts.azureedge.net/kubernetes/v1.21.11/windowszip/v1.21.11-1int.zip",
+            "https://kubernetesartifacts.azureedge.net/kubernetes/v1.21.12/windowszip/v1.21.12-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.22.8/windowszip/v1.22.8-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.23.5/windowszip/v1.23.5-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.24.0-alpha.3/windowszip/v1.24.0-alpha.3-1int.zip"

vhd/packer/install-dependencies.sh

@@ -222,7 +222,7 @@ K8S_VERSIONS="
 1.24.0-alpha.3
 1.23.5
 1.22.8
-1.21.11
+1.21.12
 1.20.15
 1.19.16
 "