Update dependency pdm to v2.19.0

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This PR contains the following updates:

Package	Update	Change	Pending
pdm (changelog)	minor	==2.18.2 -> ==2.19.0	2.19.1

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Release Notes

pdm-project/pdm (pdm)

v2.19.0

Compare Source

Breaking Changes

• The minimum supported Python version of projects using PDM has been bumped to 3.8. (#​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. (#​3163)
• Ensures that / is URL encoded in sources URL environment variables. (#​3169)
• Call functions from shared library in the in-process env_spec.py script. (#​3176)

Removals and Deprecations

• PDM no longer falls back to setuptools-pep660 when the build backend doesn't support PEP 660. (#​3159)

Miscellany

• Change the project structure to a normal package from a namespace package. (#​3155)

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