build: Bump FreeRDP version requirement
Quoting the commit here:
FreeRDP 2.4.x includes an important fix for an fd leak, that happened
when copy-pasting files from the server side to the client side.
While the fd leak did not happen in most situations (due to usually
only having small file lists), it is still desirable to prevent this
behaviour.
To ensure, that gnome-remote-desktop cannot run into such fd leaks,
bump the FreeRDP version requirement.
Edited by Pascal Nowack