Gate Assembly.LoadFrom on .NET 5+

Author: marner2

src/Serilog.Settings.Configuration/Settings/Configuration/ConfigurationReader.cs

@@ -357,7 +357,11 @@ static IReadOnlyCollection<Assembly> LoadConfigurationAssemblies(IConfiguration
 
         foreach (var (assemblyName, path) in assemblyFinder.FindAssembliesContainingName("serilog"))
         {
+#if NET5_0_OR_GREATER
             var assumed = path == null ? Assembly.Load(assemblyName) : Assembly.LoadFrom(path);
+#else
+            var assumed = Assembly.Load(assemblyName);
+#endif
             assemblies.Add(assumed);
         }