bump crengine: fix CSS cascade, support :is(), other fixes #11353
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Includes koreader/crengine#552 :
Closes Opening footnote for a large epub (> 10MB) is slow when the file is opened the first time, but it is fast to open the footnote when the file is opened second time #11254
See HTML5.css, the CSS cascade, and other stylesheet questions crengine#551
Closes RFC: crengine private CSS syntax extension for matching text #11323, see there for syntax, use cases and screenshots
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itemCloses EPUB only shows one page: Jono Bacon, The Art of Community, second Edition (archive.org) #11268
This change is