Update dependency pdm-backend to v2.3.1

[RKIMetadataExchange]

This PR contains the following updates:

Package	Type	Update	Change	Pending
pdm-backend	build-system.requires	patch	==2.3.0 -> ==2.3.1	2.3.2

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Release Notes

pdm-project/pdm-backend (pdm-backend)

v2.3.1

Compare Source

   🐞 Bug Fixes

• Handle unexpected hg repo when parse scm version  -  by @​huxuan in https://github.com/pdm-project/pdm-backend/issues/237 (d6fec)
• Treat PDM_BUILD_SCM_VERSION empty string as unset  -  by @​ryukinix in https://github.com/pdm-project/pdm-backend/issues/238 (596f1)
• Honor the current working directory when importing pdm_build.py Close #​245  -  by @​frostming in https://github.com/pdm-project/pdm-backend/issues/245 (ba98c)
• Errors when using the editables backend with the includes field. Fixes #​242  -  by @​frostming in https://github.com/pdm-project/pdm-backend/issues/242 (59396)
• Vendor editables  -  by @​frostming (95da7)

    View changes on GitHub

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[erichesse]

All tests pass