bump base for Clang fix (#4955)
bump base for Clang fix (#4955)

https://github.com/koreader/koreader-base/pull/897
Hzj-jie/koreader,mwoz123/koreader,Frenzie/koreader,NiLuJe/koreader,poire-z/koreader,mihailim/koreader,houqp/koreader,NiLuJe/koreader,koreader/koreader,Frenzie/koreader,poire-z/koreader,pazos/koreader,koreader/koreader,Markismus/koreader