chore(rootfs/Dockerfile): update Azure CLI to v2.22.1 (#279)

See https://docs.microsoft.com/en-us/cli/azure/release-notes-azure-cli?tabs=azure-cli#april-19-2021

Author: mboersma

rootfs/Dockerfile

@@ -4,7 +4,7 @@ LABEL name="deis-go-dev" \
       maintainer="Matt Boersma <matt.boersma@microsoft.com>"
 
 ENV ANSIBLE_VERSION=2.10.3 \
-    AZCLI_VERSION=2.20.0 \
+    AZCLI_VERSION=2.22.1 \
     DOCKER_VERSION=20.10.2 \
     ETCDCTL_VERSION=v3.1.8 \
     GO_VERSION=1.16.3 \