Bump Microsoft.NET.Test.Sdk from 17.14.1 to 18.5.1

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.5.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

tests/PVOutput.Net.Tests/PVOutput.Net.Tests.csproj

@@ -21,7 +21,7 @@
 		  <PrivateAssets>all</PrivateAssets>
 		  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 		</PackageReference>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\PVOutput.Net\PVOutput.Net.csproj" />