Update dependency pdm to v2.16.1 (#216)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [pdm](https://togithub.com/pdm-project/pdm)
([changelog](https://pdm-project.org/latest/dev/changelog/)) | minor |
`==2.15.4` -> `==2.16.1` |

---

### Release Notes

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

###
[`v2.16.1`](https://togithub.com/pdm-project/pdm/blob/HEAD/CHANGELOG.md#Release-v2161-2024-06-26)

[Compare
Source](https://togithub.com/pdm-project/pdm/compare/2.16.0...2.16.1)

##### Bug Fixes

- Fix new interface from pbs_installer regarding `build_dir` and best
match auto-install strategy for `pdm use`
(same as for `pdm python install --list`)
([#&#8203;2943](https://togithub.com/pdm-project/pdm/issues/2943))
- Fix crash when pdm is used with `importlib-metadata` version 8.0.
([#&#8203;2974](https://togithub.com/pdm-project/pdm/issues/2974))

###
[`v2.16.0`](https://togithub.com/pdm-project/pdm/blob/HEAD/CHANGELOG.md#Release-v2160-2024-06-25)

[Compare
Source](https://togithub.com/pdm-project/pdm/compare/2.15.4...2.16.0)

##### Features & Improvements

- Add `--no-extras` to `pdm export` to strip extras from the
requirements. Now the default behavior is to keep extras.
([#&#8203;2519](https://togithub.com/pdm-project/pdm/issues/2519))
- Support PEP 723: running scripts with inline metadata in standalone
environment with dependencies.
([#&#8203;2924](https://togithub.com/pdm-project/pdm/issues/2924))
- `pdm use` and `pdm python install` now take `requires-python` into
account (incl. from pyproject.toml) if python version
not specified and `pdm use` provides auto installation by that.
([#&#8203;2943](https://togithub.com/pdm-project/pdm/issues/2943))
- `--no-isolation` no longer installs `build-requires` nor dynamic build
dependencies, to be consistent with `pip`.
([#&#8203;2944](https://togithub.com/pdm-project/pdm/issues/2944))
- Add notifiers in CLI output when global project is being used.
([#&#8203;2952](https://togithub.com/pdm-project/pdm/issues/2952))
- Use `tool.pdm.resolution` table when calculating the content hash of
project file, previously only `overrides` table was used.
This will change the hash already stored in the lockfile, so bump the
lockfile version to `4.4.2`.
([#&#8203;2956](https://togithub.com/pdm-project/pdm/issues/2956))

##### Bug Fixes

- Add max retries on read timeout or bad connection.
([#&#8203;2914](https://togithub.com/pdm-project/pdm/issues/2914))
- Don't update local files if they don't change.
([#&#8203;2966](https://togithub.com/pdm-project/pdm/issues/2966))
- Don't list python versions that don't have any installation link for
the current platform.
([#&#8203;2970](https://togithub.com/pdm-project/pdm/issues/2970))

##### Documentation

- Clarify the purposes of `pdm outdated` and `--unconstrained` option.
([#&#8203;2965](https://togithub.com/pdm-project/pdm/issues/2965))
- Some clarifications on the interpreter selection and central package
cache.
([#&#8203;2967](https://togithub.com/pdm-project/pdm/issues/2967))

</details>

---

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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==2.15.4
+pdm==2.16.1
 pre-commit==3.7.1
 wheel==0.43.0