feat: add support for Kubernetes v1.20.15 (#4837)

See https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md#changelog-since-v12014

pkg/api/common/versions.go

@@ -271,7 +271,8 @@ var AllKubernetesSupportedVersions = map[string]bool{
 	"1.20.11":        false,
 	"1.20.12":        false,
 	"1.20.13":        false,
-	"1.20.14":        true,
+	"1.20.14":        false,
+	"1.20.15":        true,
 	"1.21.0-alpha.1": false,
 	"1.21.0-alpha.2": false, // disabled, see https://github.com/kubernetes/kubernetes/issues/98419
 	"1.21.0-alpha.3": false,

vhd/packer/configure-windows-vhd.ps1

@@ -121,7 +121,7 @@ function Get-FilesToCacheOnVHD {
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.19.15-azs/windowszip/v1.19.15-azs-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.20.11-azs/windowszip/v1.20.11-azs-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.19.16/windowszip/v1.19.16-1int.zip",
-            "https://kubernetesartifacts.azureedge.net/kubernetes/v1.20.14/windowszip/v1.20.14-1int.zip",
+            "https://kubernetesartifacts.azureedge.net/kubernetes/v1.20.15/windowszip/v1.20.15-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.21.9/windowszip/v1.21.9-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.22.6/windowszip/v1.22.6-1int.zip",
             "https://kubernetesartifacts.azureedge.net/kubernetes/v1.23.3/windowszip/v1.23.3-1int.zip",

vhd/packer/install-dependencies.sh

@@ -223,7 +223,7 @@ K8S_VERSIONS="
 1.23.3
 1.22.6
 1.21.9
-1.20.14
+1.20.15
 1.20.11-azs
 1.19.16
 1.19.15-azs