Bump MarkdownSnippets.MsBuild from 17.5.0 to 17.6.0 in /src

Bumps [MarkdownSnippets.MsBuild](https://github.com/SimonCropp/MarkdownSnippets) from 17.5.0 to 17.6.0.
- [Release notes](https://github.com/SimonCropp/MarkdownSnippets/releases)
- [Commits](https://github.com/SimonCropp/MarkdownSnippets/commits)

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

Author: dependabot-preview[bot]

src/Tests/Tests.csproj

@@ -9,7 +9,7 @@
     <PackageReference Include="Verify.Xunit" Version="1.5.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
-    <PackageReference Include="MarkdownSnippets.MsBuild" Version="17.5.0" PrivateAssets="All" />
+    <PackageReference Include="MarkdownSnippets.MsBuild" Version="17.6.0" PrivateAssets="All" />
     <ProjectReference Include="..\NServiceBus.Hyperion\NServiceBus.Hyperion.csproj" />
     <PackageReference Include="ProjectDefaults" Version="1.0.37" PrivateAssets="All" />
   </ItemGroup>