### Godot version

v4.0.rc1.official [8843d9ad3]

### System information

Lubuntu

### Issue description

You can't use + or += to mutate typed arrays.

It seems to be not correctly getting the type information from the second operand.

An erudite poster on the discord puts it differently:
> it's more like operator + doesn't retain Array typing
> the syntax for Array Concatenation via operators, but the idea gets across i think


The error you see is:
```Trying to assign an array of type "Array" to a variable of type "Array[int]".```


### Steps to reproduce

```
	var Alice: Array[int] = [1,2,3]
	var Bob: Array[int] = [4,5,6]
	Alice += Bob
```
This will crash with the above error message.

### Minimal reproduction project

[plus_syntax_broken_demo_project.zip](https://github.com/godotengine/godot/files/10694514/plus_syntax_broken_demo_project.zip)

}
		}
		
		for (const KeyValue<int, GDScriptParser::ArrayNode *> &E : arrays) {
			int index = E.key;
			if (index < par_types.size() && par_types[index].has_container_element_type()) {
				update_array_literal_element_type(E.value, par_types[index].get_container_element_type());
			}
		}
		validate_call_arg(par_types, default_arg_count, method_flags.has_flag(METHOD_FLAG_VARARG), p_call);
		if (base_type.kind == GDScriptParser::DataType::ENUM && base_type.is_meta_type) {
			
			base_type.is_meta_type = false;
		}
		if (is_self && static_context && !method_flags.has_flag(METHOD_FLAG_STATIC)) {
			if (parser->current_function) {
				
				GDScriptParser::FunctionNode *parent_function = parser->current_function;
				while (parent_function->source_lambda) {
					parent_function = parent_function->source_lambda->parent_function;
				}
				push_error(vformat(R"*(Cannot call non-static function "%s()" from static function "%s()".)*", p_call->function_name, parent_function->identifier->name), p_call);
			} else {
				push_error(vformat(R"*(Cannot call non-static function "%s()" for static variable initializer.)*", p_call->function_name), p_call);
			}
		} else if (!is_self && base_type.is_meta_type && !method_flags.has_flag(METHOD_FLAG_STATIC)) {
			base_type.is_meta_type = false; 
			push_error(vformat(R"*(Cannot call non-static function "%s()" on the class "%s" directly. Make an instance instead.)*", p_call->function_name, base_type.to_string()), p_call);
		} else if (is_self && !method_flags.has_flag(METHOD_FLAG_STATIC)) {
			mark_lambda_use_self();