### 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)

ERR_FAIL_NULL(p_node);
	ERR_FAIL_NULL(p_list);
	if (p_list->find(p_node) != nullptr) {
		return;
	}
	p_list->push_back(p_node);
	
	
	if (p_node->base_type.class_type != nullptr) {
		get_class_node_current_scope_classes(p_node->base_type.class_type, p_list);
	}
	if (p_node->outer != nullptr) {
		get_class_node_current_scope_classes(p_node->outer, p_list);
	}
}
Error GDScriptAnalyzer::resolve_class_inheritance(GDScriptParser::ClassNode *p_class, const GDScriptParser::Node *p_source) {