Update supported Python and Django versions according to endoflife.date

[Copilot]

This PR updates the supported Python and Django versions to align with the current end-of-life (EOL) status according to endoflife.date.

Changes Summary

Removed EOL Versions

• Python 3.9 (EOL October 2025) - removed from CI/CD workflows and setup.py classifiers
• Django 5.0 (EOL August 2025) - removed from CI/CD workflows and setup.py classifiers

Added Currently Supported Versions

• Django 5.2 (Released April 2025, EOL April 2026) - added to CI/CD workflows and setup.py classifiers
• Python 3.14 (Released October 2024, EOL October 2029) - added to CI/CD workflows and setup.py classifiers

Updated Version Constraints

• Updated tests/requirements.txt to use Django >=4.2,<5.3 and DRF >=3.15,<3.16
• Added version 1.6 to the README compatibility matrix

Currently Supported Versions

After these changes, the library now officially supports:

• Python: 3.10, 3.11, 3.12, 3.13, 3.14
• Django: 4.2 LTS, 5.1, 5.2
• Django REST Framework: 3.15

Files Modified

• .github/workflows/test.yml - Updated CI/CD test matrix
• .github/workflows/test-postgres.yml - Updated CI/CD test matrix for PostgreSQL tests
• setup.py - Updated Python and Django framework classifiers
• README.md - Added version 1.6 to compatibility matrix
• tests/requirements.txt - Updated version constraints for dependencies

Testing

The CI/CD workflows will now test against all currently supported Python and Django versions, ensuring compatibility across the supported version matrix.

References

• https://endoflife.date/python
• https://endoflife.date/django

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Fixes #204

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update supported Python and Django versions according to endoflife.date</issue_title>
<issue_description>We should update support for both Python and Django according to the latest supported versions shown at:

• https://endoflife.date/django
• https://endoflife.date/python

This includes:

• Adding all currently supported Python and Django versions in documentation, setup/config files, and compatibility matrix (if present)
• Removing any unsupported/end-of-life versions from documentation and configuration
• Updating CI/CD pipelines to test against all actively supported Python and Django versions
• Ensuring all dependencies are compatible with the updated supported versions
• Updating test requirements and any version badges

References:

• https://endoflife.date/python
• https://endoflife.date/django

Tasks:

• Add all currently supported Python and Django versions to documentation and setup/config files
• Remove unsupported versions from documentation and config
• Update CI/CD pipelines to test against supported Python and Django versions
• Ensure all dependencies are compatible with the updated supported versions
• Update compatibility matrix and version badges if present</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #204

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[nezhar]

@copilot also add support for python 3.14 in this PR

[Copilot]

@copilot also add support for python 3.14 in this PR

Added Python 3.14 support in commit 2f60de8. The changes include:

• Added Python 3.14 to CI/CD test matrix in both test.yml and test-postgres.yml
• Added Python 3.14 classifier to setup.py
• Updated README.md compatibility matrix to show Python 3.10-3.14 support for version 1.6