Use stable release of Django 6.0 in CI workflows

[ulgens]

No description provided.

[Copilot]

Pull request overview

This pull request attempts to update CI workflows to use the stable release of Django 6.0 instead of the release candidate version (6.0rc1). However, based on the support end date mentioned in the comments (April 2027), Django 6.0 would be released in April 2026, which is after the current date of December 2025. This means the stable version does not exist yet.

Key Changes:

• Replaces all occurrences of '6.0rc1' with '6.0' across test and lint workflows
• Updates 11 different job configurations that test against multiple OS platforms and shell environments
• Maintains consistency in exclusion rules for Python/Django version combinations

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/test.yml	Updates Django version from '6.0rc1' to '6.0' across 11 test job configurations (Linux, Windows, macOS with various shells: bash, fish, zsh, PowerShell, pwsh)
.github/workflows/lint.yml	Updates Django version from '6.0rc1' to '6.0' in the linting job configuration

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