Update repositories.txt

[galarb]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/galarb/PenYX.git:

Linting library in PenYX
INFO: No header file found matching library name (PenYX.h). Best practices are for primary header filename to match     
      library name. (Rule LS008)                                                                                        
WARNING: A commonly misspelled word was found in the library.properties paragraph field. Suggested correction: control  
         pen movement in 3 dimensions (Rule LP035)                                                                      
WARNING: Invalid category field value Robotics in library.properties. See                                               
         https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format (Rule LP038) 
WARNING: No license file found. See:                                                                                                                  
         https://docs.github.com/en/free-pro-team@latest/github/creating-cloning-and-archiving-repositories/licensing-a-repository#detecting-a-license
         (Rule LD002)                                                                                                                                 
WARNING: No example sketches found. Please provide examples. See:                                                       
         https://arduino.github.io/arduino-cli/latest/library-specification/#library-examples (Rule LD004)              

Linter results for project: 0 ERRORS, 4 WARNINGS

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[github-actions]

Your submission has now been accepted! Thanks for your contribution to the Arduino Library Manager index.

The library(s) will be available for installation via Library Manager within a day's time.

You can check the logs from the Library Manager indexer for your library(s) here:
http://downloads.arduino.cc/libraries/logs/github.com/galarb/PenYX/