Update dotnet.aspnetcore to 8.0.18

Author: xdev-renovate

src/OpenIdConnectServerMock.csproj

@@ -27,8 +27,8 @@
 
   <ItemGroup>
     <PackageReference Include="Duende.IdentityServer" Version="7.2.4" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.17" />
-    <PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="8.0.17" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.18" />
+    <PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="8.0.18" />
     <PackageReference Include="Serilog.AspNetCore" Version="8.0.3" />
     <PackageReference Include="YamlDotNet" Version="16.3.0" />
   </ItemGroup>