Add support for Django 5.1

[nrbnlulu]

This PR adds support for Django 5.1:

• Update Django version range to include 5.1
• Update CI configuration to test with Django 5.1

Note: Python 3.13 support has been postponed until strawberry-graphql adds support for it.

Summary by Sourcery

Add support for Django 5.1 by updating the version range in the project dependencies and adjusting the CI configuration to test against this new version.

New Features:

• Add support for Django 5.1 by updating the version range in the project dependencies.

CI:

• Update CI configuration to include testing with Django 5.1.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR implements Django 5.1 support by updating version constraints in the project configuration and adjusting the CI workflow. The changes primarily involve modifying version ranges and test matrix configurations while maintaining backward compatibility.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Update Django version compatibility range	Extend Django version upper bound from <5.1 to <5.2 Remove deprecated types-pkg-resources dependency	pyproject.toml
Expand CI test matrix to include Django 5.1	Add Django 5.1 to the test matrix Add exclusion rules for Python 3.8 and 3.9 with Django 5.1 Update test matrix compatibility comments	.github/workflows/tests.yml
Update Python version support in black configuration	Add Python 3.11 and 3.12 to black target versions	pyproject.toml

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[sourcery-ai]

Hey @nrbnlulu - I've reviewed your changes - here's some feedback:

Overall Comments:

• Could you explain why types-pkg-resources was removed? Is it no longer needed?

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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