Build hook: issue with `extract_items` when `target_path` is in a subfolder

[benoit74]

When the extract_items action is configured with a target_path is in a subfolder, the subfolder is not created and the action fails.

Sample failing configuration below.

[files.assets.actions."bootstrap"]
action="extract_items"
source="https://github.com/twbs/bootstrap/releases/download/v5.0.0-beta2/bootstrap-5.0.0-beta2-dist.zip"
zip_paths=[
    "bootstrap-5.0.0-beta2-dist/css/bootstrap.min.css",
]
target_paths=[
    "bootstrap/bootstrap.min.css",
]