Bump Microsoft.NET.Test.Sdk from 17.14.1 to 18.0.0 (#30)

---
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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

common.test.props

@@ -9,7 +9,7 @@
 
   <!-- Packages for test support  -->
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.*" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="xunit" Version="2.*" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.*" />
     <PackageReference Include="FluentAssertions" Version="8.*" />