Bump Microsoft.NET.ILLink.Tasks from 8.0.15 to 8.0.18

---
updated-dependencies:
- dependency-name: Microsoft.NET.ILLink.Tasks
  dependency-version: 8.0.18
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/OpenOnlineConfig/OpenOnlineConfig/OpenOnlineConfig.csproj

@@ -20,6 +20,8 @@
   </PropertyGroup>
 
   <ItemGroup>
+
+    <PackageReference Include="Microsoft.NET.ILLink.Tasks" Version="8.0.18" />
     <None Include="..\..\..\LICENSE">
       <Pack>True</Pack>
       <PackagePath></PackagePath>