Remove deprecated packages

SystemExtensions.NetStandard/Extensions/ObjectExtensions.cs

@@ -1,31 +1,7 @@
-using Newtonsoft.Json;
-
-namespace System.Extensions;
+namespace System.Extensions;
 
 public static class ObjectExtensions
 {
-    public static T? Deserialize<T>(this string serialized)
-        where T : class
-    {
-        if (serialized.IsNullOrWhiteSpace())
-        {
-            throw new ArgumentException("Provided serialized string cannot be null or whitespace", nameof(serialized));
-        }
-
-        return JsonConvert.DeserializeObject<T>(serialized);
-    }
-
-    public static string Serialize<T>(this T obj)
-        where T : class
-    {
-        if (obj is null)
-        {
-            throw new ArgumentNullException(nameof(obj));
-        }
-
-        return JsonConvert.SerializeObject(obj);
-    }
-
     public static T Cast<T>(this object obj)
     {
         return (T)obj;
@@ -36,11 +12,6 @@ public static class ObjectExtensions
         return obj as T;
     }
 
-    public static Optional<T> ToOptional<T>(this T obj)
-    {
-        return Optional.FromValue(obj);
-    }
-
     public static T ThrowIfNull<T>([ValidatedNotNull] this T? obj, string name) where T : class
     {
         if (obj is null)