Recommended update for calibre

This recommended update provides version 2.46.0 for calibre:

- Updated BuildRequires and Requires to the latest requirements
(this should prevent bugs like #boo935943).

- Update to 2.46.0:
* PDF Input: Add support for PDF outlines (bookmarks), if
present, they are used as the metadata Table of Contents.
* Add tool to compress images losslessly.
* Add support for new Kobo firmware 3.19.
* Disable the Amazon EU stores, at Amazon's request.
* And more, for details see: http://calibre-ebook.com/whats-new

- Update to 2.45.0:
* Improved handling of covers.
* And more, for details see: http://calibre-ebook.com/whats-new

- Update to 2.43.0:
* Driver for the new NookGlowlight Plus. This device only allows
sending of files inside the NOOK folder, so calibre now
follows that limitation.
* When converting AZW4 files to PDF, skip the conversion and
simply unwrap the PDF file already embedded inside the AZW4
file.
* Edit Book: Add a 'Smart Comment' tool to easily comment/
uncomment text.
* Tag mapper: Add new rule types to upper-case, lower-case or
capitalize tags.
* Amazon metadata download: Fix for website change at amazon.com
that prevented ratings from being downloaded.
* And more, for details see: http://calibre-ebook.com/whats-new

- Update to 2.41.0:
* Edit Book: Allow editing an unzipped EPUB (a folder) as a book
* Edit Book: Allow easily removing items from the popup menu for
the 'Insert tag' button.
* Make Tag Browser more useable with keyboard shortcuts.
Configure the keyboard shortcuts in Preferences->Keyboard->Tag
Browser.
* ToC editor: Add context menu item to change selected entries to
upper case.
* Bugfixes and improved news sources.
* For details see http://calibre-ebook.com/whats-new

- Update to 2.40.0:
* A new tool to apply Tag mapper rules to existing books in the
library. To use it, go to Preferences->Toolbars and add the
tool to the toolbar.
* Kindle driver: Detect books in Amazon's new KFX format present
on e-ink kindles (this only detects KFX books and allows to
delete, nothing more).
* For details see http://calibre-ebook.com/whats-new

Fixed bugs
bnc#935943
Calibre: Plugin update check causes AttributeError
Selected Binaries
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