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

[codecov]

Codecov Report

Base: 91.07% // Head: 91.07% // No change to project coverage 👍

Coverage data is based on head (873d889) compared to base (69161fd).
Patch has no changes to coverable lines.

❗ Current head 873d889 differs from pull request most recent head 4d309dc. Consider uploading reports for the commit 4d309dc to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #116   +/-   ##
=======================================
  Coverage   91.07%   91.07%           
=======================================
  Files          10       10           
  Lines         381      381           
  Branches       35       35           
=======================================
  Hits          347      347           
  Misses         33       33           
  Partials        1        1           

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[sarina]

Can't update pylintrc to fix strings because it was previously manually edited. #117