Update dependency pdm to v2.19.1 (#298)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [pdm](https://redirect.github.com/pdm-project/pdm)
([changelog](https://pdm-project.org/latest/dev/changelog/)) | patch |
`==2.19.0` -> `==2.19.1` |

---

### Release Notes

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

###
[`v2.19.1`](https://redirect.github.com/pdm-project/pdm/blob/HEAD/CHANGELOG.md#Release-v2191-2024-09-23)

[Compare
Source](https://redirect.github.com/pdm-project/pdm/compare/2.19.0...2.19.1)

##### Bug Fixes

- PDM libraries are not loaded correctly for in-process scripts when
installed in the user site.
([#&#8203;3178](https://redirect.github.com/pdm-project/pdm/issues/3178))

</details>

---

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rebase/retry checkbox.

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---

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requirements.txt

@@ -1,5 +1,5 @@
 cruft==2.15.0
 mex-release @ git+https://github.com/robert-koch-institut/mex-release.git
-pdm==2.19.0
+pdm==2.19.1
 pre-commit==3.8.0
 wheel==0.44.0