(chocolatey#2690) Use Windows 2019 for Vagrant VM

As described in 2690, using 2022 for this test environment is likely to cause test failures.
We can revisit when 2690 has been more fully investigated, but for now this is a known working environment for the purposes of our tests.

Author: vexx32

tests/Vagrantfile

@@ -2,7 +2,7 @@
 # vi: set ft=ruby :
 
 Vagrant.configure("2") do |config|
-  config.vm.box = "StefanScherer/windows_2022"
+  config.vm.box = "StefanScherer/windows_2019"
   config.vm.boot_timeout = 600
 
   # windows