fix: upgrade pymongo and event-tracking

[regisb]

Description:

The constraint on event tracking is causing packages that depend on event-tracking (such as edx-search) to require pymongo==3.3.13, which is turn breaking other packages, such as openedx/forum. This requirement is no longer necessary since July 31st 2024 when this issue was closed: openedx/edx-platform#34586
Edx-platform now runs pymongo=4.4.0: https://github.com/openedx/edx-platform/blob/master/requirements/edx/base.txt

Merge checklist:

• All reviewers approved
• CI build is green
• If adding new checks, followed how_tos/0001-adding-new-checks.rst
• Changelog record added (should I?)
• Documentation updated (not only docstrings) (if needed)
• Commits are squashed

[openedx-webhooks]

Thanks for the pull request, @regisb!

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