### Godot version

4.0.3

### System information

Win7

### Issue description

![image](https://github.com/godotengine/godot/assets/28286958/abec9d3c-e078-424c-9430-d9fe8897aad6)


### Steps to reproduce

1. Create shader
2. Add uint with hex, e.g. 0xffffu

### Minimal reproduction project

N/A
String str;
					while (is_ascii_identifier_char(GETCHAR(0))) {
						str += char32_t(GETCHAR(0));
						char_idx++;
					}
					
					
					int idx = 0;
					while (keyword_list[idx].text) {
						if (str == keyword_list[idx].text) {
							return _make_token(keyword_list[idx].token);
						}
						idx++;
					}
					str = str.replace("dus_", "_");
					return _make_token(TK_IDENTIFIER, str);
				}
				if (GETCHAR(0) > 32) {
					return _make_token(TK_ERROR, "Tokenizer: Unknown character #" + itos(GETCHAR(0)) + ": '" + String::chr(GETCHAR(0)) + "'");
				} else {
					return _make_token(TK_ERROR, "Tokenizer: Unknown character #" + itos(GETCHAR(0)));
				}
			} break;
		}
	}
	ERR_PRINT("BUG");
	return Token();
#undef GETCHAR
}
bool ShaderLanguage::_lookup_next(Token &r_tk) {