Latest update fixed the issue.

Alright thank you for your replies. In fact, there was an update of FileZilla today and it did fix this issue. I am able to connect again over FTPS.

Thank you for your reply.
I don't know for SFTP (SSH File Transfer Protocol) because my hosting plan doesn't include this option so I can't test it or use it. FTPS is different: this is FTP over TLS/SSL (so basically a secured regular FTP). I don't know SCP.
Yes I didn't catch all the implication of these GnuTLS/FileZilla issues and as you said I think this should be dealt with on the FileZilla side.
Should we raise this to FileZilla dev?

Thank you for your reply. How can we upstream this issue?