Update Calibre to 3.39.1

Description

The current version is 2.75.1. We get an inevitable bump as part of an OS update.

The update itself is handled by the Systems, there are no code changes on the Archive itself.

How to test: Sanity-check that downloading works in formats AZW3, EPUB, and MOBI still works the same as on beta.

Environment

None

Status

Assignee

james_

Reporter

redsummernight

Roadmap

Export

Priority

Medium

Affects versions

Fix versions

None

Components

BackEnd

Difficulty

Medium

Required Access Level

None

Milestone

Internal 0.9
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