build(deps): bump Microsoft.NET.Test.Sdk from 17.8.0 to 17.9.0 in /Notation.Plugin.AzureKeyVault.Tests (#167)

Author: dependabot[bot]

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

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="Moq" Version="4.20.70" />
     <PackageReference Include="Moq.AutoMock" Version="3.5.0" />
     <PackageReference Include="System.Security.Cryptography.Pkcs" Version="8.0.0" />