Updated calibre packages fix security vulnerability

ReDoS vulnerability in htmlpreprocessrules in ebooks/conversion/preprocess.py...

MGASA-2021-0593 Updated calibre packages fix security vulnerability

ReDoS vulnerability in htmlpreprocessrules in ebooks/conversion/preprocess.py...

MGASA-2017-0047 Updated calibre packages fix security vulnerability

Newer devices like Kobo Aura HD requires newer versions of calibre for their new firmwares. Current calibre package does not support them. Also, our current calibre packages in both core and backports repositories have a security issue CVE-2016-10187. Newer versions of calibre 2.75.0 + fixes this...