### 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
for (int i = 0; i < p_match_branch->patterns.size(); i++) {
		if (i > 0) {
			push_text(" , ");
		}
		print_match_pattern(p_match_branch->patterns[i]);
	}
	push_line(" :");
	increase_indent();
	print_suite(p_match_branch->block);
	decrease_indent();
}
void GDScriptParser::TreePrinter::print_match_pattern(PatternNode *p_match_pattern) {
	switch (p_match_pattern->pattern_type) {
		case PatternNode::PT_LITERAL:
			print_literal(p_match_pattern->literal);
			break;
		case PatternNode::PT_WILDCARD:
			push_text("_");
			break;
		case PatternNode::PT_REST:
			push_text("..");
			break;
		case PatternNode::PT_BIND:
			push_text("Var ");
			print_identifier(p_match_pattern->bind);
			break;
		case PatternNode::PT_EXPRESSION: