### 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)

if (p_statement == nullptr) {
		return;
	}
	switch (p_statement->type) {
		case GDScriptParser::Node::IF:
		case GDScriptParser::Node::FOR:
		case GDScriptParser::Node::MATCH:
		case GDScriptParser::Node::PATTERN:
		case GDScriptParser::Node::RETURN:
		case GDScriptParser::Node::WHILE:
			
			if (p_suite->get_datatype().is_set() && (p_suite->get_datatype() != p_statement->get_datatype())) {
				
				
				p_suite->datatype.kind = GDScriptParser::DataType::VARIANT;
				p_suite->datatype.type_source = GDScriptParser::DataType::UNDETECTED;
			} else {
				p_suite->set_datatype(p_statement->get_datatype());
				p_suite->datatype.type_source = GDScriptParser::DataType::INFERRED;
			}
			break;
		default:
			break;
	}
}
void GDScriptAnalyzer::resolve_suite(GDScriptParser::SuiteNode *p_suite) {