Bump MSTest.TestFramework from 2.2.8 to 2.2.9 in /src.csharp (#820)
Bump MSTest.TestFramework from 2.2.8 to 2.2.9 in /src.csharp (#820)

Bumps [MSTest.TestFramework](https://github.com/microsoft/testfx) from 2.2.8 to 2.2.9.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Commits](https://github.com/microsoft/testfx/compare/v2.2.8...v2.2.9)

---
updated-dependencies:
- dependency-name: MSTest.TestFramework
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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