Log Message:
py-pdm_backend: update to 2.4.3.

Bump validate-pyproject to 0.9.0  -  by @henryiii in #265 (23484)
Update dependencies  -  by @frostming (7f7dd)
Update badge  -  by @frostming (6fdd4)
Migrate tool config to pyproject.toml  -  by @frostming (d5d5c)