### 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
String script_path;
	bool for_completion = false;
	bool panic_mode = false;
	bool can_break = false;
	bool can_continue = false;
	List<bool> multiline_stack;
	ClassNode *head = nullptr;
	Node *list = nullptr;
	List<ParserError> errors;
#ifdef DEBUG_ENABLED
	bool is_ignoring_warnings = false;
	List<GDScriptWarning> warnings;
	HashSet<GDScriptWarning::Code> ignored_warnings;
	HashSet<int> unsafe_lines;
#endif
	GDScriptTokenizer tokenizer;
	GDScriptTokenizer::Token previous;
	GDScriptTokenizer::Token current;
	ClassNode *current_class = nullptr;
	FunctionNode *current_function = nullptr;
	SuiteNode *current_suite = nullptr;
	CompletionContext completion_context;
	CompletionCall completion_call;
	List<CompletionCall> completion_call_stack;
	bool passed_cursor = false;
	bool in_lambda = false;
	bool lambda_ended = false; 
	typedef bool (GDScriptParser::*AnnotationAction)(const AnnotationNode *p_annotation, Node *p_target);
	struct AnnotationInfo {
		enum TargetKind {