refactor: add @openedx in renovate automate configuration

[Mashal-m]

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Description

Add @openedx in renovate automate configuration.

Ticket

Create common renovate config that automates @edx and @openedx namespaced minor/patch version upgrades

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• Which edX user roles will this change impact? Common user roles are "Learner", "Course Author", "Developer", and "Operator".
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Supporting information

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Testing instructions

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Other information

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (6cb5096) 61.53% compared to head (13a4914) 61.53%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #336   +/-   ##
=======================================
  Coverage   61.53%   61.53%           
=======================================
  Files          34       34           
  Lines         325      325           
  Branches       69       69           
=======================================
  Hits          200      200           
  Misses        118      118           
  Partials        7        7           

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