### Godot version

v4.0.3.stable.official [5222a99f5]
Master [6101240231600c871f5c5473872532c68ea3268c] (confirmed by https://github.com/godotengine/godot/issues/77666#issuecomment-1568952502)

### System information

Window 10

### Issue description

References are not unreferenced at the end of `if` scopes.

### Steps to reproduce

Copy, paste and run the snippet below, check the results:

```gdscript
extends Node


func _ready() -> void:
  var ref := RefCounted.new()
  var ref_count : int

  # OK
  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # OK
  if true:
    var temp := ref
    temp = null

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # FAIL
  if true:
    var temp := ref

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)
```

Output example:

```
Expected: 1, Result: 1
Expected: 1, Result: 1
Expected: 1, Result: 2
```

### Minimal reproduction project

N/A
memdelete(codegen.generator);
	return gd_function;
}
GDScriptFunction *GDScriptCompiler::_make_static_initializer(Error &r_error, GDScript *p_script, const GDScriptParser::ClassNode *p_class) {
	r_error = OK;
	CodeGen codegen;
	codegen.generator = memnew(GDScriptByteCodeGenerator);
	codegen.class_node = p_class;
	codegen.script = p_script;
	StringName func_name = SNAME("@static_initializer");
	bool is_static = true;
	Variant rpc_config;
	GDScriptDataType return_type;
	return_type.has_type = true;
	return_type.kind = GDScriptDataType::BUILTIN;
	return_type.builtin_type = Variant::NIL;
	codegen.function_name = func_name;
	codegen.is_static = is_static;
	codegen.generator->write_start(p_script, func_name, is_static, rpc_config, return_type);
	
	
	GDScriptCodeGenerator::Address class_addr(GDScriptCodeGenerator::Address::CLASS);
	
	
	
	for (const GDScriptParser::ClassNode::Member &member : p_class->members) {
		if (member.type != GDScriptParser::ClassNode::Member::VARIABLE) {
			continue;
		}
		const GDScriptParser::VariableNode *field = member.variable;