Bump Microsoft.NET.ILLink.Tasks from 8.0.19 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
- 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] <[email protected]>

Author: dependabot[bot]

src/Microsoft.OpenApi.YamlReader/Microsoft.OpenApi.YamlReader.csproj

@@ -64,6 +64,7 @@
     </ItemGroup>
 
     <ItemGroup>
+      <PackageReference Include="Microsoft.NET.ILLink.Tasks" Version="8.0.20" />
         <None Include="../../README.md" Pack="true" PackagePath="" />
     </ItemGroup>
 </Project>

src/Microsoft.OpenApi/Microsoft.OpenApi.csproj

@@ -50,6 +50,7 @@
     </ItemGroup>
 
     <ItemGroup>
+      <PackageReference Include="Microsoft.NET.ILLink.Tasks" Version="8.0.20" />
       <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.14.15">
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         <PrivateAssets>all</PrivateAssets>