Update dependency pdm to <2.26.3

[RKIMetadataExchange]

This PR contains the following updates:

Package	Update	Change
pdm (changelog)	patch	<2.26.2 -> <2.26.3

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Release Notes

pdm-project/pdm (pdm)

v2.26.2

Compare Source

Features & Improvements

• Only parse TOML document with tomlkit when writing is required. (#​3672)
• Add SHA256 checksums for binary releases during the release workflow and create an installer script that downloads binaries from GitHub releases with automatic platform detection and checksum verification. (#​3679)

Bug Fixes

• Fix test_use_python_write_file_multiple_versions to match PDM's actual behavior. (#​3660)
• Correctly calculate the venv path for UV_PROJECT_ENVIRONMENT env var when using uv mode. (#​3675)
• Ensure implementation.gil_disabled is a boolean in get_current_env_spec. This fix an issue that free-threaded wheels get rejected incorrectly. (#​3677)
• Fix CLI help formatting on Python 3.14+. (#​3683)
• Make PdmBasicAuth a cached_property to accelerate execution. (#​3684)

Removals and Deprecations

• Add deprecation warning for pdm search command as PyPI no longer supports search API. (#​3674)

Miscellany

• Add tests to utils.fs_supports_link_method and utils.convert_to_datetime. (#​3541)

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