SE-3724: squash warnings

[eLRuLL]

Description:

This PR squashes the following warning (as part of the Squash a Warning event):

edx_django_utils/monitoring/tests/test_middleware.py::TestMonitoringMemoryMiddleware::test_memory_monitoring_when_enabled /home/elrull/workspace/opencraft/edx-django-utils/edx_django_utils/monitoring/internal/middleware.py:180: DeprecationWarning: memory_info_ex() is deprecated and will be removed; use memory_info() instead 'ext_memory_info': process.memory_info_ex(),

It can be checked running tests:

make test

Merge checklist:

• [x] All reviewers approved
• [x] CI build is green
• [ ] ~Version bumped~
• [ ] ~Changelog record added~
• [ ] ~Documentation updated (not only docstrings)~
• [ ] Commits are squashed

Post merge:

• [ ] ~Create a tag~
• [ ] ~Check new version is pushed to PyPi after tag-triggered build is finished.~
• [ ] Delete working branch (if not needed anymore)

[openedx-webhooks]

Thanks for the pull request, @eLRuLL! I've created OSPR-5301 to keep track of it in JIRA, where we prioritize reviews. Please note that it may take us up to several weeks or months to complete a review and merge your PR.

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[eLRuLL]

@edx-webhook this is ready for review

[openedx-webhooks]

@eLRuLL 🎉 Your pull request was merged!

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[natabene]

@eLRuLL Thank you for your contribution.