build(deps): bump Azure.Identity from 1.12.0 to 1.13.1 in /Notation.Plugin.AzureKeyVault (#215)

Author: dependabot[bot]

Notation.Plugin.AzureKeyVault/Notation.Plugin.AzureKeyVault.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Azure.Identity" Version="1.12.0" />
+    <PackageReference Include="Azure.Identity" Version="1.13.1" />
     <PackageReference Include="Azure.Security.KeyVault.Certificates" Version="4.6.0" />
     <PackageReference Include="Azure.Security.KeyVault.Keys" Version="4.6.0" />
     <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.6.0" />