Bump python version to fix test suite

[Archmonger]

Summary by Sourcery

This pull request updates the CI workflow configuration to use Python 3.11, aiming to fix issues in the test suite.

• CI:
  • Updated the CI workflow to use Python 3.11 instead of Python 3.9.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the Python version used in the GitHub Actions workflow for the Django project from 3.9 to 3.11. This change is intended to fix issues in the test suite that may be related to the older Python version.

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[sourcery-ai]

Hey @Archmonger - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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