Simplify Microsoft.OpenApi package references

Author: Youssef1313

src/Microsoft.OpenApi/Microsoft.OpenApi.csproj

@@ -24,13 +24,10 @@
         <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
     </PropertyGroup>
     <ItemGroup>        
-        <PackageReference Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="5.6.0">
-          <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-          <PrivateAssets>all</PrivateAssets>
-        </PackageReference>        
-        <PackageReference Include="System.Text.Json" Version="[8.0.5,)" />
-        <NuGetAuditSuppress Include="https://github.com/advisories/GHSA-hh2w-p6rv-4g7w" />
-        <NuGetAuditSuppress Include="https://github.com/advisories/GHSA-8g4q-xg66-9fp4" />
+        <PackageReference Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="5.6.0" PrivateAssets="all" />
+
+        <!-- We don't need the package reference under .NET 8. We get STJ from the BCL. -->
+        <PackageReference Include="System.Text.Json" Version="[8.0.5,)" Condition="'$(TargetFramework)' != 'net8.0'" />
     </ItemGroup>
 
     <ItemGroup>