### 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
return _make_token(TK_ERROR, "Invalid (unsigned integer) numeric constant");
							} else {
								return _make_token(TK_ERROR, "Invalid (integer) numeric constant");
							}
						}
					}
					char_idx += str.length();
					Token tk;
					if (period_found || exponent_found || float_suffix_found) {
						tk.type = TK_FLOAT_CONSTANT;
					} else if (uint_suffix_found) {
						tk.type = TK_UINT_CONSTANT;
					} else {
						tk.type = TK_INT_CONSTANT;
					}
					if (hexa_found) {
						tk.constant = (double)str.hex_to_int();
					} else {
						tk.constant = str.to_float();
					}
					tk.line = tk_line;
					return tk;
				}
				if (GETCHAR(0) == '.') {
					
					char_idx++;
					return _make_token(TK_PERIOD);
				}
				if (is_ascii_identifier_char(GETCHAR(0))) {