Update Roslynator.Analyzers and adjust framework references

Updated Directory.Build.props to use Roslynator.Analyzers 4.12.9.
Removed net8.0 and net7.0 FrameworkReferences from Genocs.Core.csproj.
Now, Microsoft.AspNetCore.App is referenced only for net6.0.

Author: GioemaNocco

Directory.Build.props

@@ -21,7 +21,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Roslynator.Analyzers" Version="4.12.8">
+        <PackageReference Include="Roslynator.Analyzers" Version="4.12.9">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>

src/Genocs.Core/Genocs.Core.csproj

@@ -44,17 +44,6 @@
     <ItemGroup>
         <PackageReference Include="Figgle" Version="0.5.1" />
         <PackageReference Include="Scrutor" Version="5.0.1" />
-    </ItemGroup>
-
-    <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
-        <FrameworkReference Include="Microsoft.AspNetCore.App" />
-    </ItemGroup>
-
-    <ItemGroup Condition="'$(TargetFramework)' == 'net7.0'">
-        <FrameworkReference Include="Microsoft.AspNetCore.App" />
-    </ItemGroup>
-
-    <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
         <FrameworkReference Include="Microsoft.AspNetCore.App" />
     </ItemGroup>