refactor: add @openedx in renovate automate configuration

[Mashal-m]

Description:

Add @openedx in renovate automate configuration.

Ticket

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

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (677d728) 81.25% compared to head (2fe017b) 81.25%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #342 +/- ## ======================================= Coverage 81.25% 81.25% ======================================= Files 4 4 Lines 32 32 Branches 4 4 ======================================= Hits 26 26 Misses 6 6 ```

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