RetroArch: bump to version 1.9.6

[kwyxz]

Changelog (relevant to Haiku):

ARCHIVE: Fix archive delimiter detection when file path contains no slashes
CHEEVOS: Reset cached progress each time menu is opened
GFX: Fix uninitialized variables in gfx_display_draw_cursor
HISTORY: Hide ‘Add to Favorites’ when viewing an entry of the favorites playlist
INPUT: ‘Analog to Digital Type’ usability improvements
INPUT: Add support for mapping multiple controllers to a single input device
INPUT/REMAPPING: Add support for mapping multiple controllers to a single input device
INPUT/LIGHTGUN: Bind lightgun trigger to first mouse button by default
LOCALIZATION: Fetch translations from Crowdin
LOCALIZATION: Fix Switchres menu texts
MENU/OZONE: Ensure sidebar display status is updated correctly when performing rapid menu navigation
MENU/XMB: Dynamic wallpaper fix
MENU/XMB: Icon opacity fix
MENU/QT/WIMP: Fix default core detection when playlist file name does not match ‘db_name’
PLAYLISTS: Optimise scanning of large data sets