Study and fix crash on updating lxml==5.1.0

[farhan]

In the xblock-sdk git repository lxml has been updated to 5.1.0 in PR

which is crashing the code.
When I run python manage.py run server I experience the following crash

  File "/Users/farhankhan/.pyenv/versions/xblock-sdk/lib/python3.8/site-packages/xblock/fields.py", line 19, in <module>
    from lxml import etree
ImportError: dlopen(/Users/farhankhan/.pyenv/versions/xblock-sdk/lib/python3.8/site-packages/lxml/etree.cpython-38-darwin.so, 0x0002): symbol not found in flat namespace '_exsltDateXpathCtxtRegister'

I have experienced the same crash when updating lxml package here

In this ticket, we need to figure out the root cause of it and try to fix it by either via code update to fixing the lxml to lower version.

Some Effected repos:

• XBlock
• xblock-sdk
• FeedbackXblock

[Agrendalath]

This one also affects the DnDv2 XBlock: https://github.com/openedx/xblock-drag-and-drop-v2/blob/78e4135/requirements/constraints.txt#L19-L20.

[irtazaakram]

PRs related to this issue

openedx/FeedbackXBlock#81
openedx/xblock-lti-consumer#471
openedx/edx-ora2#2207 depends on openedx/i18n-tools#146
openedx/xblock-drag-and-drop-v2#404

[irtazaakram]

All PRs have been merged.