Bumping to Flexget v3.3.6

[DirectorX]

includes fixes and improvements:

• overhaul hebits search plugin
• sites/lostfilm.py: return None instead of raising exception
• sites/lostfilm.py: updated the list of mirrors
• [feature] sftp_list - add dirs_only option to exclude files from entry parsing
• [fix] cli templates: Fix crash when using flexget templates fix (#3377 @ flexget)
• add warning if both files_only and dirs_only are set