File sync from PrometheusClientNet/sync-files

Author: github-actions[bot]

Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>9.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118">
@@ -10,7 +10,7 @@
   </ItemGroup>
   <ItemGroup>
     <AdditionalFiles Include="$(SolutionDir)stylecop.json">
-      <Link>Properties\stylecop.json</Link>
+      <Link>stylecop.json</Link>
     </AdditionalFiles>
   </ItemGroup>
   <PropertyGroup>