Bump MarkdownSnippets.MsBuild from 28.0.0-beta.13 to 28.0.0-beta.19

---
updated-dependencies:
- dependency-name: MarkdownSnippets.MsBuild
  dependency-version: 28.0.0-beta.19
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -7,7 +7,7 @@
     <PackageVersion Include="EfClassicLocalDb" Version="23.2.1" />
     <PackageVersion Include="EfLocalDb" Version="23.2.1" />
     <PackageVersion Include="EntityFramework" Version="6.5.1" />
-    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.13" />
+    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.19" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="10.0.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.2" />