Enable Dependabot updates to Poetry

[d33bs]

Description

This PR focuses on long-term sustainability for this project by enabling Dependabot to automatically update the Poetry lockfile. Normally this is a task which must be performed manually. By enabling this change we can have Dependabot automatically update the dependency references (which still fall into the constraints of the pyproject.toml file).

Thanks for any feedback!

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

Please ensure that all boxes are checked before indicating that a pull request is ready for review.

• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• 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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[gwaybio]

Great to see 🤖

[d33bs]

Thanks @gwaybio ! Merging this in now.