Bump MSTest.TestAdapter from 3.9.3 to 3.10.4

---
updated-dependencies:
- dependency-name: MSTest.TestAdapter
  dependency-version: 3.10.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/SourceBrowser/src/Directory.Packages.props

@@ -29,7 +29,7 @@
 
     <!-- test dependencies -->
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
-    <PackageVersion Include="MSTest.TestAdapter" Version="3.9.3" />
+    <PackageVersion Include="MSTest.TestAdapter" Version="3.10.4" />
     <PackageVersion Include="MSTest.TestFramework" Version="3.9.3" />
     <PackageVersion Include="Selenium.WebDriver" Version="3.14.0" />
     <PackageVersion Include="coverlet.collector" Version="1.2.0" />