windows pool upgraded to 2022 (#9746)

Co-authored-by: Mansoor Sarfraz <msarfraz+microsoft@microsoft.com>

Author: msarfraz

.azure-pipelines/templates/variables.yml

@@ -1,4 +1,4 @@
 variables:
   ubuntu_pool: 'pool-ubuntu-2204'
-  windows_pool: 'pool-windows-2019'
+  windows_pool: 'pool-windows-2022'
   ubuntu_arm64_pool: 'pool-ubuntu-latest-arm64'