Bump Microsoft.NET.StringTools from 17.14.8 to 17.14.28

---
updated-dependencies:
- dependency-name: Microsoft.NET.StringTools
  dependency-version: 17.14.28
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/SourceBrowser/src/Directory.Packages.props

@@ -56,7 +56,7 @@
     <PackageVersion Include="System.ValueTuple" Version="4.6.1" />
 
     <PackageVersion Include="Microsoft.Build.Locator" Version="1.10.2" />
-    <PackageVersion Include="Microsoft.NET.StringTools" Version="17.14.8" />
+    <PackageVersion Include="Microsoft.NET.StringTools" Version="17.14.28" />
     <PackageVersion Include="Microsoft.VisualStudio.Language.Intellisense" Version="17.14.249" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />