[Identity] Adjust CI setup script (#37238)

The version of Azure CLI no longer needs to be pinned. Removing this pin
should also resolve the CI failures trying to install it.

Signed-off-by: Paul Van Eck <paulvaneck@microsoft.com>

sdk/identity/test-resources-pre.ps1

@@ -48,9 +48,6 @@ $templateFileParameters['sshPubKey'] = $sshKey
 Write-Host "Sleeping for a bit to ensure service principal is ready."
 Start-Sleep -s 45
 
-# Install this specific version of the Azure CLI to avoid https://github.com/Azure/azure-cli/issues/28358.
-pip install azure-cli=="2.56.0"
-
 $az_version = az version
 Write-Host "Azure CLI version: $az_version"
 az login --service-principal -u $TestApplicationId --tenant $TenantId --allow-no-subscriptions --federated-token $env:ARM_OIDC_TOKEN