package/freerdp: bump to version 2.6.0
2.6.0 is an maintenance and security release.
https://github.com/FreeRDP/FreeRDP/releases/tag/2.6.0
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>