Update deprecated command in azure script (#6056)

apply-rg_2.sh uses 'az group deployment' command but the command is
deprecated like the following warning message:

"This command is implicitly deprecated because command group
 'group deployment' is deprecated and will be removed in a future release.
 Use 'deployment group' instead."

This updates these deprecated commands.

FYI: The command has been deprecated since [1] on azure-cli side.
[1]: https://github.com/Azure/azure-cli/commit/991cb7cc7c9e577d8bec3b78e0316dfb5d39fe10#diff-2057bbb8441166e4910b34b09d22b58cR222