net/freerdp: update to 2.7.0 [maintainer]

https://github.com/FreeRDP/FreeRDP/blob/2.7.0/ChangeLog
Noteworthy changes:
    Backported OpenSSL3 gateway support (#7822)
    Backported various NTLM fixes
    Backported WINPR_ASSERT to ease future backports

Fixed issues:
    Backported #6786: Use /network:auto by default
    Backported #7714: Workaround for broken surface frame marker
    Backported #7733: Support 10bit X11 color (BGRX32 only)
    Backported #7745: GFX progressive double free
    Backported #7808: Disable websockets with /gt:rpc
    Backported #7815: RAIL expect LOGON_MSG_SESSION_CONTINUE

PR:		263490

MFH:		2022Q2

four cherry-picks squashed into one to reduce churn:
(cherry picked from commit a08e76c0)
(cherry picked from commit 1bf5531c)
(cherry picked from commit 338ebcca)
(cherry picked from commit 7783dde8)