Log Message:
gallery-dl: Update net/gallery-dl to 1.4.2

Changes:
1.4.2
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 - Added image-pool extractors for safebooru and rule34
 - Added option for extended tag information on booru sites (#92)
 - Added support for DeviantArt's new URL format
 - Added support for mangapark mirrors
 - Changed imagefap extractors to use HTTPS
 - Fixed crash when skipping downloads for files without known extension