chore: bump durationpy to 0.9

[jgengo]

What type of PR is this?

What this PR does / why we need it:

Invalid dash-separated key 'description-file' in 'metadata' (setup.cfg), please use the underscore name 'description_file' instead.

This means durationpy 0.7 is not PEP 517-compliant, and it's breaking the build process when using modern Python versions and tools like Poetry or pip with --use-pep517 (which Poetry uses under the hood).

[linux-foundation-easycla]

• ✅login: jgengo / (16ec3f3)

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[k8s-ci-robot]

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[k8s-ci-robot]

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[yliaog]

/release-note-none

[jgengo]

/kind bug