Update dependency pdm to v2.15.3 (#19)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [pdm](https://togithub.com/pdm-project/pdm)
([changelog](https://pdm-project.org/latest/dev/changelog/)) | patch |
`==2.15.2` -> `==2.15.3` |

---

### Release Notes

<details>
<summary>pdm-project/pdm (pdm)</summary>

###
[`v2.15.3`](https://togithub.com/pdm-project/pdm/blob/HEAD/CHANGELOG.md#Release-v2153-2024-05-20)

[Compare
Source](https://togithub.com/pdm-project/pdm/compare/2.15.2...2.15.3)

##### Bug Fixes

- Fixed pdm venv activate, to also work for windows. And added
documentation on how to authenticate to Azure Artifacts
([#&#8203;2851](https://togithub.com/pdm-project/pdm/issues/2851))
- Don't show unsupported formats in `pdm export`.
([#&#8203;2877](https://togithub.com/pdm-project/pdm/issues/2877))
- Proxy (`HTTP_PROXY` env vars) settings are ignored for custom indexes.
([#&#8203;2880](https://togithub.com/pdm-project/pdm/issues/2880))
- Fix the quoting of venv activate command for powershell.
([#&#8203;2881](https://togithub.com/pdm-project/pdm/issues/2881))
- Raise an error if the package given by `pdm update` does not exist in
the select dependency group but in other groups.
([#&#8203;2885](https://togithub.com/pdm-project/pdm/issues/2885))

</details>

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mex-{{ cookiecutter.project_name }}/requirements.txt

@@ -1,4 +1,4 @@
 cruft==2.15.0
-pdm==2.15.2
+pdm==2.15.3
 pre-commit==3.7.1
 wheel==0.43.0