testing/otpclient: upgrade to 4.0.2
https://github.com/paolostivanin/OTPClient/compare/v3.2.1...v4.0.2
https://github.com/paolostivanin/libcotp/releases/tag/v3.0.0
One thing to note for 4.0.0:
This has been marked as major release because it changes the DB format and the key derivation method. No UI change has been made.
Edited by mio