Submodules (schueltke): Update to open-source URL

Description

Update link to open-source URL: the old ssh connection is only for registered users

Related Issue(s)

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Other Changes

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Screenshots/Logs

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Testing Instructions

  1. Checkout branch and to a clean PC
  2. Try to checkout submodules recursively without being known as a gitlab user

Developer Checklist

  • Code has been tested locally and/or in pipeline.

Additional Notes

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Merge request reports

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