Bump MarkdownSnippets.MsBuild from 28.0.0-beta.6 to 28.0.0-beta.7 (#1154)

---
updated-dependencies:
- dependency-name: MarkdownSnippets.MsBuild
  dependency-version: 28.0.0-beta.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="GraphQL" Version="8.6.0" />
     <PackageVersion Include="GraphQL.MicrosoftDI" Version="8.6.0" />
     <PackageVersion Include="GraphQL.SystemTextJson" Version="8.6.0" />
-    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.6" />
+    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.7" />
     <PackageVersion Include="Microsoft.AspNetCore.Http" Version="2.3.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.10" />
     <PackageVersion Include="Microsoft.Data.SqlClient" Version="6.1.2" />