Update commons-net from 3.7 to 3.7.2

[MichaelF25]

We run into an issue after upgrading to Spring Boot 2.4.x which upgrades Spring Integration to 5.4.x and upgrades Apache Commons Net from 3.6 to 3.7.
Seems like there's a bug introduced in commons-net-3.7 which is resolved in commons-net-3.7.2 within the FTPS Client (we faced some SSL errors).
For now, we updated the dependency to commons-net manually to current version 3.7.2 which resolved the SSL errors.
Since commons-net-3.7.2 is a bugfix release, we didn't go into details what the causing issue was.

[artembilan]

Fixed via: d4a4e24.

Thanks for reporting!