xblock-free-text-response | Drop py3.8 support | replace pkg_resource with importlib.resources

[OmerBhatti]

• Drop Py3.8 support
• Upgrade python requirements
• Replace pkg_resources lib with importlib.resources

Ticket: Move on from deprecated pkg_resources api

Followed migration guide: https://importlib-resources.readthedocs.io/en/latest/migration.html

Testing:
I have tested the changes with following steps:

• Install xblock-free-text-response into xblock-sdk
• Test xblock-free-text-response functionality and not crashes
• Run tox tests

Screenshots

[openedx-webhooks]

Thanks for the pull request, @OmerBhatti!

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[e0d]

@OmerBhatti looks like there are some failing checks, can you have a look.

[feanil]

Looks like it has some quality failures that need to be resolved.