Enable DuckDB >= v0.8.0

[d33bs]

Description

This PR enables the use of DuckDB versions >= v0.8.0 (v0.9.0 was just released). I made a minor adjustment to an existing test which appeared to have issues with mixed order of columns.

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

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• I have read the CONTRIBUTING.md guidelines.
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• I have made corresponding changes to the documentation.
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• New and existing unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
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[d33bs]

Thank you @gwaybio and @falquaddoomi for your reviews! Merging this in.