Bump Azure.Identity from 1.11.3 to 1.11.4 in /samples/CustomDns (#753)

Bumps [Azure.Identity](https://github.com/Azure/azure-sdk-for-net) from 1.11.3 to 1.11.4.
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Identity_1.11.3...Azure.Identity_1.11.4)

---
updated-dependencies:
- dependency-name: Azure.Identity
  dependency-type: direct:production
...

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samples/CustomDns/CustomDns.csproj

@@ -4,7 +4,7 @@
     <AzureFunctionsVersion>v4</AzureFunctionsVersion>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Azure.Identity" Version="1.11.3" />
+    <PackageReference Include="Azure.Identity" Version="1.11.4" />
     <PackageReference Include="Azure.ResourceManager.Dns" Version="1.1.1" />
     <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
     <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.4.0" />