Bump Microsoft.NET.ILLink.Tasks from 8.0.18 to 8.0.20

---
updated-dependencies:
- dependency-name: Microsoft.NET.ILLink.Tasks
  dependency-version: 8.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -18,6 +18,7 @@
     <PackageVersion Include="Microsoft.Extensions.Caching.Memory" Version="9.0.5" />
     <PackageVersion Include="Microsoft.Extensions.FileSystemGlobbing" Version="9.0.5" />
     <PackageVersion Include="Microsoft.IO.RecyclableMemoryStream" Version="3.0.1" />
+    <PackageVersion Include="Microsoft.NET.ILLink.Tasks" Version="8.0.20" />
     <PackageVersion Include="NLog" Version="5.5.0" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.8.1" />
     <PackageVersion Include="SecurityCodeScan.VS2019" Version="5.6.7" />

ii/ii.csproj

@@ -30,6 +30,7 @@
     <ProjectReference Include="..\IsIdentifiable\IsIdentifiable.csproj" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="Microsoft.NET.ILLink.Tasks" />
     <None Update="NLog.config">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>