azurerm_firewall_policy: deprecate dns

[magodo]

This is due to service no longer accept it for all API versions.

fixes #9312

Test Result

💤 make testacc TEST=./azurerm/internal/services/network/tests TESTARGS='-run "TestAccDataSourceFirewallPolicy_|TestAccAzureRMFirewallPolicy_"'                                                                                                                                           
==> Checking that code complies with gofmt requirements...                                                                                   
==> Checking that Custom Timeouts are used...                                                                                                
==> Checking that acceptance test packages are used...                                                                                       
TF_ACC=1 go test ./azurerm/internal/services/network/tests -v -run "TestAccDataSourceFirewallPolicy_|TestAccAzureRMFirewallPolicy_" -timeout 180m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccDataSourceFirewallPolicy_basic                                                                                              
=== PAUSE TestAccDataSourceFirewallPolicy_basic                                                                                              
=== RUN   TestAccAzureRMFirewallPolicy_basic                                                                                                 
=== PAUSE TestAccAzureRMFirewallPolicy_basic                                                                                                 
=== RUN   TestAccAzureRMFirewallPolicy_complete                                                                                              
=== PAUSE TestAccAzureRMFirewallPolicy_complete                                                                                              
=== RUN   TestAccAzureRMFirewallPolicy_update                                                                                                                                                                                                                                             
=== PAUSE TestAccAzureRMFirewallPolicy_update                                                                                                
=== RUN   TestAccAzureRMFirewallPolicy_requiresImport                                                                                        
=== PAUSE TestAccAzureRMFirewallPolicy_requiresImport                                                                                        
=== RUN   TestAccAzureRMFirewallPolicy_inherit                                                                                               
=== PAUSE TestAccAzureRMFirewallPolicy_inherit                                                                                               
=== CONT  TestAccDataSourceFirewallPolicy_basic                                                                                              
=== CONT  TestAccAzureRMFirewallPolicy_update                                                                                                
=== CONT  TestAccAzureRMFirewallPolicy_complete                                                                                              
=== CONT  TestAccAzureRMFirewallPolicy_inherit                                                                                               
=== CONT  TestAccAzureRMFirewallPolicy_basic                                                                                                 
=== CONT  TestAccAzureRMFirewallPolicy_requiresImport                                                                                        
--- PASS: TestAccAzureRMFirewallPolicy_complete (128.23s)                                                                                    
--- PASS: TestAccAzureRMFirewallPolicy_basic (130.44s)                                                                                       
--- PASS: TestAccAzureRMFirewallPolicy_requiresImport (138.42s)                                                                              
--- PASS: TestAccAzureRMFirewallPolicy_inherit (150.94s)                                                                                     
--- PASS: TestAccDataSourceFirewallPolicy_basic (157.76s)                                                                                    
--- PASS: TestAccAzureRMFirewallPolicy_update (233.07s)                                                                                      
PASS                                                                  
ok      github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/network/tests       233.118s          

[magodo]

Close in favor of #9332

[ghost]

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