CI: Fix nightly job

[amotl]

Note: This PR is stacked on GH-753.

Problem

The nightly CI job started failing yesterday.

• https://github.com/crate/crate-python/actions/workflows/nightly.yml
• https://github.com/crate/crate-python/actions/runs/20085471292

Resolved

• The nightly CI job works again, triggered manually.
  https://github.com/crate/crate-python/actions/runs/20117852553

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-ci-and-cleanups

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