Bump Microsoft.ML.OnnxRuntime from 1.19.2 to 1.20.1 in /dotnet

Bumps [Microsoft.ML.OnnxRuntime](https://github.com/Microsoft/onnxruntime) from 1.19.2 to 1.20.1.
- [Release notes](https://github.com/Microsoft/onnxruntime/releases)
- [Changelog](https://github.com/microsoft/onnxruntime/blob/main/docs/ReleaseManagement.md)
- [Commits](microsoft/onnxruntime@v1.19.2...v1.20.1)

---
updated-dependencies:
- dependency-name: Microsoft.ML.OnnxRuntime
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

dotnet/Directory.Packages.props

@@ -43,7 +43,7 @@
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" />
     <PackageVersion Include="Microsoft.Bcl.TimeProvider" Version="8.0.1" />
     <PackageVersion Include="Microsoft.Identity.Client" Version="4.66.2" />
-    <PackageVersion Include="Microsoft.ML.OnnxRuntime" Version="1.19.2" />
+    <PackageVersion Include="Microsoft.ML.OnnxRuntime" Version="1.20.1" />
     <PackageVersion Include="FastBertTokenizer" Version="1.0.28" />
     <PackageVersion Include="PdfPig" Version="0.1.9" />
     <PackageVersion Include="Pinecone.NET" Version="2.1.1" />