chore: bump to pyproject-metadata 0.9.0 full release

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

src/scikit_build_core/_vendor/pyproject_metadata/__init__.py

@@ -68,7 +68,7 @@
 import packaging.utils
 import packaging.version
 
-__version__ = "0.9.0rc1"
+__version__ = "0.9.0"
 
 __all__ = [
     "ConfigurationError",