updated dependabot alert to upgrade json lib

tests/Azure.Core.TestFramework/src/Azure.Core.TestFramework.csproj

@@ -9,7 +9,7 @@
   
   <ItemGroup>
     <PackageReference Include="Azure.Identity" Version="1.3.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="NUnit" Version="3.13.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />