Update dependency pdm to v2.19.1 (#93)

This PR contains the following updates:

| Package | Update | Change | Pending |
|---|---|---|---|
| [pdm](https://redirect.github.com/pdm-project/pdm)
([changelog](https://pdm-project.org/latest/dev/changelog/)) | minor |
`==2.18.1` -> `==2.19.1` | `2.19.2` |

---

### 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))

###
[`v2.19.0`](https://redirect.github.com/pdm-project/pdm/blob/HEAD/CHANGELOG.md#Release-v2190-2024-09-23)

[Compare
Source](https://redirect.github.com/pdm-project/pdm/compare/2.18.2...2.19.0)

##### Breaking Changes

- The minimum supported Python version of projects using PDM has been
bumped to 3.8.
([#&#8203;3176](https://redirect.github.com/pdm-project/pdm/issues/3176))

##### Bug Fixes

- Fallback version to 0.0.0 when the version is not specified or empty.
This can avoid crash when building such project.
([#&#8203;3163](https://redirect.github.com/pdm-project/pdm/issues/3163))
- Ensures that `/` is URL encoded in sources URL environment variables.
([#&#8203;3169](https://redirect.github.com/pdm-project/pdm/issues/3169))
- Call functions from shared library in the in-process `env_spec.py`
script.
([#&#8203;3176](https://redirect.github.com/pdm-project/pdm/issues/3176))

##### Removals and Deprecations

- PDM no longer falls back to `setuptools-pep660` when the build backend
doesn't support PEP 660.
([#&#8203;3159](https://redirect.github.com/pdm-project/pdm/issues/3159))

##### Miscellany

- Change the project structure to a normal package from a namespace
package.
([#&#8203;3155](https://redirect.github.com/pdm-project/pdm/issues/3155))

###
[`v2.18.2`](https://redirect.github.com/pdm-project/pdm/blob/HEAD/CHANGELOG.md#Release-v2182-2024-09-10)

[Compare
Source](https://redirect.github.com/pdm-project/pdm/compare/2.18.1...2.18.2)

##### Bug Fixes

- Respect the `excludes` and `overrides` settings when installing
packages.
([#&#8203;3113](https://redirect.github.com/pdm-project/pdm/issues/3113))
- Fix a bug of export command that packages with extras are included
twice.
([#&#8203;3123](https://redirect.github.com/pdm-project/pdm/issues/3123))
- Remove empty groups when removing packages with `pdm remove`.
([#&#8203;3133](https://redirect.github.com/pdm-project/pdm/issues/3133))
- When running `pdm venv purge`, if the current project's python version
had been referencing the removed venv then clear it out.
([#&#8203;3137](https://redirect.github.com/pdm-project/pdm/issues/3137))
- Fix command `pdm config` to not show site configuration file path if
it doesn't exist.
([#&#8203;3149](https://redirect.github.com/pdm-project/pdm/issues/3149))
- Now when `--no-markers` is used, the exported requirements can only
work on the current platform.
([#&#8203;3152](https://redirect.github.com/pdm-project/pdm/issues/3152))

##### Miscellany

- Skip tests related to python installation on non-standard platforms.
([#&#8203;3053](https://redirect.github.com/pdm-project/pdm/issues/3053))

</details>

---

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---

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Co-authored-by: Nicolas Drebenstedt <[email protected]>