Update repositories.txt

[rgot-org]

No description provided.

[github-actions]

Hi @rgot-org.
Your pull request has been detected as something other than a Library Manager submission.
A maintainer will need to review it before it can be merged.

If you intended to submit a library, please check the instructions and update your pull request if necessary:
https://github.com/arduino/library-registry/blob/main/README.md#instructions

[github-actions]

A problem was found with your submission https://github.com/Nat/birdhouse_sdk

❌ ERROR: Unable to load submission URL. Is the repository public?

[github-actions]

Thanks for your interest in contributing to the Arduino Library Manager index @rgot-org
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