### 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
}
				
				GDScriptDataType typeof_type;
				typeof_type.has_type = true;
				typeof_type.kind = GDScriptDataType::BUILTIN;
				typeof_type.builtin_type = Variant::INT;
				GDScriptCodeGenerator::Address type = codegen.add_local("@match_type", typeof_type);
				Vector<GDScriptCodeGenerator::Address> typeof_args;
				typeof_args.push_back(value);
				gen->write_call_utility(type, "typeof", typeof_args);
				
				
				for (int j = 0; j < match->branches.size(); j++) {
					if (j > 0) {
						
						gen->write_else();
					}
					const GDScriptParser::MatchBranchNode *branch = match->branches[j];
					codegen.start_block(); 
					
					_add_locals_in_block(codegen, branch->block);
#ifdef DEBUG_ENABLED
					
					gen->write_newline(branch->start_line);
#endif
					
					GDScriptCodeGenerator::Address pattern_result = codegen.add_temporary();
					for (int k = 0; k < branch->patterns.size(); k++) {
						pattern_result = _parse_match_pattern(codegen, err, branch->patterns[k], value, type, pattern_result, k == 0, false);
						if (err != OK) {