Fix github url strings (org edx -> openedx)

[sarina]

This PR was autogenerated

This pr replaces the old GitHub organization, github.com/edx, with the new GitHub organization, github.com/openedx.

Tagging @openedx/tcril-engineering for review, but others are welcome to provide review.

Ref: openedx/axim-engineering#42

[sarina]

@Agrendalath - do you know why the CI is just hanging at the unit tests part?

It just took a long time, it's failing with this error:

Traceback (most recent call last):
  File "/home/runner/work/xblock-drag-and-drop-v2/xblock-drag-and-drop-v2/tests/integration/test_sizing.py", line 196, in test_wide_image_mobile
    self._check_mobile_container_size()
  File "/home/runner/work/xblock-drag-and-drop-v2/xblock-drag-and-drop-v2/tests/integration/test_sizing.py", line 191, in _check_mobile_container_size
    self.assertEqual(drag_container.size['width'], MOBILE_WINDOW_WIDTH - 2*horizontal_padding)
AssertionError: 984 != 360

This can't be due to my code. Any ideas how to proceed?

[Agrendalath]

@sarina, I've noticed some non-deterministic test failures in this repo since we moved to GitHub Actions - e.g. #289 passed all checks but failed when I merged it. I've already scheduled an internal ticket for myself to check why it's happening. I'm planning to take a look at this early next week.

To avoid blocking this, I suggest merging it as-is, since these test failures are unrelated. Does it make sense?

[sarina]

@Agrendalath yep, totally makes sense, and thanks for the approval 😄