Track Django 6.0 and 6.1 support and removal of Python 3.10

[pandafy]

Goal

Track support for Django 6.0 and 6.1 and the removal of Python 3.10 across public OpenWISP Django modules.

A checkmark means the relevant change has been merged. Open PRs are marked as in progress.

Module	Django 6.0 and 6.1	Drop Python 3.10	Issue or PR
openwisp-utils	✅ Merged	✅ Merged	Issue #788, PR #792
django-flat-json-widget	✅ Merged	✅ Merged	Issue #67, PR #68
django-x509	✅ Merged	✅ Merged	Issue #253, PR #254
django-rest-framework-gis	✅ Merged	✅ Merged	Django 6.0 PR #353, 6.1 PR #370, Python 3.10 Issue #393, PR #394
openwisp-users	✅ Merged	✅ Merged	Issue #590, PR #595
openwisp-ipam	✅ Merged	✅ Merged	Issue #256, PR #257
django-loci	✅ Merged	✅ Merged	Issue #256, PR #257
openwisp-notifications	✅ Merged	✅ Merged	Issue #525, PR #526
openwisp-controller	✅ Merged	✅ Merged	Issue #1546, PR #1547
openwisp-monitoring	✅ Merged	✅ Merged	Issue #883, PR #884
openwisp-radius	✅ Merged	✅ Merged	Issue #822, PR #823
openwisp-firmware-upgrader	✅ Merged	✅ Merged	Issue #504, PR #505
openwisp-network-topology	✅ Merged	✅ Merged	Issue #341, PR #342

Please link any missing issues or PRs and update the table as changes are merged.