caltechlibrary/dibs: Release 0.5.2

Description

This version fixes a [bug reported (with a fix) by @dlasusa](https://github.com/caltechlibrary/dibs/issues/93) involving incorrect time zone locale handling in the viewer interface, and also bumps up the required version of [Pillow](https://pypi.org/project/Pillow/) to address [several security vulnerabilities](https://github.com/caltechlibrary/dibs/security/dependabot/3) flagged by Dependabot. It also updates a number of other dependencies in `requirements.txt` to their latest versions.

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Other

DIBS is an implementation of a basic controlled digital lending (CDL) system using IIIF to make scanned books available for time-limited viewing.

Additional details