Bump Microsoft.ML from 1.7.1 to 4.0.2

---
updated-dependencies:
- dependency-name: Microsoft.ML
  dependency-version: 4.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/machine-learning/tutorials/snippets/text-classification-tf/csharp/TextClassificationTF.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.ML" Version="1.7.1" />
+    <PackageReference Include="Microsoft.ML" Version="4.0.2" />
     <PackageReference Include="Microsoft.ML.SampleUtils" Version="0.19.1" />
     <PackageReference Include="Microsoft.ML.TensorFlow" Version="1.7.1" />
     <PackageReference Include="SciSharp.TensorFlow.Redist" Version="2.7.0" />