Bump Microsoft.NET.ILLink.Tasks from 8.0.20 to 8.0.21

---
updated-dependencies:
- dependency-name: Microsoft.NET.ILLink.Tasks
  dependency-version: 8.0.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

JsonFeedNet/JsonFeedNet.csproj

@@ -33,7 +33,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.ILLink.Tasks" Version="8.0.20" />
+    <PackageReference Include="Microsoft.NET.ILLink.Tasks" Version="8.0.21" />
     <None Include="..\README.md" Pack="true" PackagePath="\" />
     <None Include="..\LICENSE" Pack="false" />
   </ItemGroup>