fix: ensure hub close does also remove global event loop reference

[oliverhaas]

See celery/celery#9983.

[Copilot]

Pull Request Overview

This PR adds functionality to automatically clear the global event loop reference when a Hub instance is closed, preventing potential issues with dangling references. The implementation ensures that only the Hub that is currently set as the global event loop gets cleared when closed.

Key Changes

• Modified Hub.close() to clear the global event loop variable if the closing hub is the current loop
• Added two new test cases to verify the behavior: one for clearing when the hub is current, another for not clearing when a different hub is current

Reviewed Changes

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

File	Description
kombu/asynchronous/hub.py	Added logic in close() method to clear global _current_loop if it matches the closing hub instance
t/unit/asynchronous/test_hub.py	Added two test cases to verify the new global event loop cleanup behavior

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.16%. Comparing base (4e74395) to head (e816ee7).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2404   +/-   ##
=======================================
  Coverage   81.15%   81.16%           
=======================================
  Files          77       77           
  Lines        9717     9719    +2     
  Branches     1094     1095    +1     
=======================================
+ Hits         7886     7888    +2     
  Misses       1625     1625           
  Partials      206      206           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[oliverhaas]

Will do the linter stuff when I'm home.

[auvipy]

please also fix the lint errors

[Copilot]

Pull Request Overview

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

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.