Use stable release of Django 6.0 in CI workflows

[ulgens]

No description provided.

[Copilot]

Pull request overview

This PR updates the Django version specification in CI workflows from the release candidate 6.0rc1 to the stable release 6.0. However, based on the inline date comment "April 2027" associated with Django 6.0 and the current date being December 4, 2025, there appears to be a critical timing issue that needs verification.

Key Changes:

• Replace all references to Django 6.0rc1 with 6.0 in test matrix configurations
• Update corresponding exclude rules to use 6.0 instead of 6.0rc1

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 multiple test jobs (PostgreSQL, SQLite, MySQL, MariaDB, Oracle, and MongoDB tests) including matrix definitions and exclusion rules
.github/workflows/lint.yml	Updates Django version from 6.0rc1 to 6.0 in the lint job matrix and exclusion rules

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