Remove pragma disabling SYSLIB0011 (#2032)

Author: slozier

src/core/IronPython/Runtime/ClrModule.cs

@@ -1179,9 +1179,7 @@ public static void EnableProfiler(CodeContext/*!*/ context, bool enable) {
                 // something more complex, let the binary formatter handle it                    
                 BinaryFormatter bf = new BinaryFormatter();
                 MemoryStream stream = new MemoryStream();
-#pragma warning disable SYSLIB0011 // BinaryFormatter serialization methods are obsolete in .NET 5.0
                 bf.Serialize(stream, self);
-#pragma warning restore SYSLIB0011
                 data = stream.ToArray().MakeString();
                 format = null;
             }
@@ -1225,9 +1223,7 @@ public static object Deserialize(string serializationFormat, [NotNone] string/*!
 
             MemoryStream stream = new MemoryStream(data.MakeByteArray());
             BinaryFormatter bf = new BinaryFormatter();
-#pragma warning disable SYSLIB0011 // BinaryFormatter serialization methods are obsolete in .NET 5.0
             return bf.Deserialize(stream);
-#pragma warning restore SYSLIB0011
         }
 #endif
     }