net/libcmis: update to 0.6.1 release (+)
libcmis 0.6.3
- More robust handling of server responses: added bounds and missing-value checks across the XML, SOAP, JSON, multipart and base64 parsing paths
- Reject stray control characters in URLs, headers, credentials and proxy settings, and bound the size and duration of a response
- Run curl_global_init once via std::call_once
- Build fixes for boost 1.86, libxml2 2.12 and clang
- Switched continuous integration to GitHub Actions