chore(deps): update pdm to v2.26.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence	Type	Update
pdm (changelog)	2.26.2 -> 2.26.3				patch
pdm-project/pdm	2.26.2 -> 2.26.3			repository	patch

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Release Notes

pdm-project/pdm (pdm)

v2.26.3

Compare Source

Features & Improvements

• Port to hishel 1.0.0. (#​3700)

Bug Fixes

• Update .gitignore file in the default template. (#​3686)
• Correct the sysconfig variables for Python standalone build installations. (#​3693)
• Ignore packages.vcs.requested-revision if it's None when formatting pylock.toml. (#​3694)
• Fix test failures with uv test cases using non-venv Python interpreters. (#​3698)

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