Update repositories.txt

[rui-huang-opt]

No description provided.

[github-actions]

❌ ERROR: Arduino Lint found errors with https://github.com/rhrhhrhr/MPC_ruih:

Linting library in MPC_ruih
INFO: No header file found matching library name (Arduino-MPC.h). Best practices are for primary header filename to     
      match library name.                                                                                               
      See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format            
      (Rule LS008)                                                                                                      
ERROR: Library name Arduino-MPC starts with "Arduino". These names are reserved for official libraries.      
       See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
       (Rule LP012)                                                                                          

Linter results for project: 1 ERRORS, 0 WARNINGS

-------------------

Linting sketch in MPC_ruih/examples/matrixTest

Linter results for project: no errors or warnings

-------------------

Linting sketch in MPC_ruih/examples/mpcTest

Linter results for project: no errors or warnings

-------------------

Linter results for projects: 1 ERRORS, 0 WARNINGS

[github-actions]

Thanks for your interest in contributing to the Arduino Library Manager index @rhrhhrhr
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

[per1234]

@ArduinoBot please check it again

[github-actions]

Hello! I'm checking your submission again.

[github-actions]

A problem was found with your submission https://github.com/rhrhhrhr/MPC_ruih

❌ ERROR: Submission URL is already in the Library Manager index.

[per1234]

Closing as duplicate of #2859