### 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)

PtrToArg<R>::encode(PtrToArg<A>::convert(left) / PtrToArg<B>::convert(right), r_ret);
	}
	static Variant::Type get_return_type() { return GetTypeInfo<R>::VARIANT_TYPE; }
};
template <class R, class A, class B>
class OperatorEvaluatorDivNZ {
public:
	static void evaluate(const Variant &p_left, const Variant &p_right, Variant *r_ret, bool &r_valid) {
		const A &a = *VariantGetInternalPtr<A>::get_ptr(&p_left);
		const B &b = *VariantGetInternalPtr<B>::get_ptr(&p_right);
		if (b == 0) {
			r_valid = false;
			*r_ret = "Division by zero error";
			return;
		}
		*r_ret = a / b;
		r_valid = true;
	}
	static inline void validated_evaluate(const Variant *left, const Variant *right, Variant *r_ret) {
		*VariantGetInternalPtr<R>::get_ptr(r_ret) = *VariantGetInternalPtr<A>::get_ptr(left) / *VariantGetInternalPtr<B>::get_ptr(right);
	}
	static void ptr_evaluate(const void *left, const void *right, void *r_ret) {
		PtrToArg<R>::encode(PtrToArg<A>::convert(left) / PtrToArg<B>::convert(right), r_ret);
	}
	static Variant::Type get_return_type() { return GetTypeInfo<R>::VARIANT_TYPE; }
};
template <>
class OperatorEvaluatorDivNZ<Vector2i, Vector2i, Vector2i> {