bump base: remove zsync dependencies, bump crengine (#8015)
bump base: remove zsync dependencies, bump crengine (#8015)

crengine bump includes:
- Regex search: fix potential pattern cache bug
- XML file detection: ignore BOM
koreader/koreader,poire-z/koreader,poire-z/koreader,Frenzie/koreader,koreader/koreader,Frenzie/koreader,NiLuJe/koreader,NiLuJe/koreader