Bump Microsoft.NET.Test.Sdk from 17.12.0 to 18.0.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

test/AStar.Dev.Api.Usage.Sdk.Tests.Unit/AStar.Dev.Api.Usage.Sdk.Tests.Unit.csproj

@@ -10,7 +10,7 @@
     <ItemGroup>
         <PackageReference Include="coverlet.collector" Version="6.0.2"/>
         <PackageReference Include="JetBrains.Annotations" Version="2025.2.2"/>
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0"/>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0"/>
         <PackageReference Include="Shouldly" Version="4.3.0"/>
         <PackageReference Include="xunit" Version="2.9.2"/>
         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2"/>