### 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
PT_LITERAL,
			PT_EXPRESSION,
			PT_BIND,
			PT_ARRAY,
			PT_DICTIONARY,
			PT_REST,
			PT_WILDCARD,
		};
		Type pattern_type = PT_LITERAL;
		union {
			LiteralNode *literal = nullptr;
			IdentifierNode *bind;
			ExpressionNode *expression;
		};
		Vector<PatternNode *> array;
		bool rest_used = false; 
		struct Pair {
			ExpressionNode *key = nullptr;
			PatternNode *value_pattern = nullptr;
		};
		Vector<Pair> dictionary;
		HashMap<StringName, IdentifierNode *> binds;
		bool has_bind(const StringName &p_name);
		IdentifierNode *get_bind(const StringName &p_name);
		PatternNode() {