chore(deps): update pdm to v2.26.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence	Type	Update
pdm (changelog)	2.26.4 → 2.26.6				patch
pdm-project/pdm	2.26.4 → 2.26.6			repository	patch

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Release Notes

pdm-project/pdm (pdm)

v2.26.6

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Bug Fixes

• Support packaging==26.0 changes for version comparison (#​3729)

v2.26.5

Compare Source

Bug Fixes

• Respect the project path when using cookiecutter template in pdm init command. (#​3721)
• Fix a bug that resolution.excludes is not applied when evaluating candidates from the lock file. (#​3726)

Documentation

• Remove chatbot from the docs page footer. (#​3722)
• Generate llms.txt for docs powered by mkdocs-llmstxt. (#​3723)

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