Update repositories.txt

[SimonVonSchmude]

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[github-actions]

A problem was found with your submission https://gitlab.kh-berlin.de/elab/Cabluino

❌ ERROR: gitlab.kh-berlin.de is not currently supported as a Git hosting website for Library Manager.

See: https://github.com/arduino/library-registry/blob/main/FAQ.md#what-are-the-requirements-for-a-library-to-be-added-to-library-manager

[github-actions]

Thanks for your interest in contributing to the Arduino Library Manager index @SimonVonSchmude
Please resolve the error(s) mentioned in the previous comment.

After resolving the issue, trigger this check again by doing one of the following:

• Commit the required change to the branch you submitted this pull request from.
• Comment here, mentioning @ArduinoBot in the comment.

❗ NOTE: It is not necessary to open a new pull request. ❗

More information:
https://github.com/arduino/library-registry/blob/main/README.md#if-the-problem-is-with-the-pull-request