Bump System.Composition from 9.0.7 to 9.0.8

---
updated-dependencies:
- dependency-name: System.Composition
  dependency-version: 9.0.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

tools/docfx/Roadmap.DotFX.csproj

@@ -27,7 +27,7 @@
 
   <ItemGroup>
     <PackageReference Include="Handlebars.Net" Version="2.1.6" />
-    <PackageReference Include="System.Composition" Version="9.0.7" />
+    <PackageReference Include="System.Composition" Version="9.0.8" />
     <PackageReference Include="Microsoft.DocAsCode.Common" Version="$(DocFxVersion)" />
     <PackageReference Include="Microsoft.DocAsCode.MarkdigEngine" Version="$(DocFxVersion)" />
     <PackageReference Include="Microsoft.DocAsCode.Plugins" Version="$(DocFxVersion)" />