Remove unused reference

Author: devlead

src/Directory.Packages.props

@@ -6,7 +6,6 @@
   <ItemGroup>
     <PackageVersion Include="Argon.Xml" Version="0.33.5" />
     <PackageVersion Include="Verify" Version="31.14.0" />
-    <PackageVersion Include="Azure.Identity" Version="1.21.0" />
     <PackageVersion Include="coverlet.collector" Version="8.0.1" />
     <PackageVersion Include="Microsoft.Extensions.TimeProvider.Testing" Version="10.4.0" />
     <PackageVersion Include="Microsoft.Net.Http.Headers" Version="10.0.5" />