Update to use mcr.microsoft.com (PowerShell#17272)

TravisEz13 · web-flow · commit e08edcb82d94 · 2022-05-05T15:27:59.000-07:00
diff --git a/test/docker/networktest/Dockerfile b/test/docker/networktest/Dockerfile
@@ -1,5 +1,5 @@
 # escape=`
-FROM microsoft/windowsservercore
+FROM mcr.microsoft.com/windows/servercore:ltsc2022
 
 SHELL ["pwsh.exe","-command"]
 
