Can't sign URL with array parameters

Example Magento 2 REST API URL to sign:
```
https://domain.com/rest/all/V1/categories/list?searchCriteria[filterGroups][0][filters][0][field]=url_key&searchCriteria[filterGroups][0][filters][0][value]=something
```

Error:
```
Warning: rawurlencode() expects parameter 1 to be string, array given in /path/to/vendor/daviddesberg/oauth/src/OAuth/OAuth1/Signature/Signature.php on line 57
```