Bump deptry to 0.15.0

[fpgmaas]

Description of the change

Bump deptry from 0.13.0 to 0.15.0

Motivation

It is not strictly necessary, but recent releases show some significant increases in performance (see e.g. release notes for 0.14.0), so it might be nice to bump the version.

Type of change

Choose one: Other

Checklist

• [x] I have performed a self-review of my code.
• [x] I have added detailed comments to my code where applicable.
• [x] I have verified that my change does not break existing code.
• [x] My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• [x] I am familiar with the Google Style Guide for the language I have coded in.
• [ ] I have read through the Contributing Guide and signed the Contributor License Agreement.

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