Update repositories.txt

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[github-actions]

Hi @ERLtech.
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]

❌ ERROR: Arduino Lint found errors with https://github.com/ERLtech/ERLtech_Robot.git:

Linting library in ERLtech_Robot
ERROR: Library name ERLtech_Robot not found in the Library Manager index. Library names are not allowed to change after 
       being added to the index.                                                                                        
       See: https://github.com/arduino/library-registry/blob/main/FAQ.md#how-can-i-change-a-librarys-name               
       (Rule LP018)                                                                                                     
WARNING: Invalid category field value device control in library.properties                                     
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP038)                                                                                          

Linter results for project: 1 ERRORS, 1 WARNINGS

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

Linting sketch in ERLtech_Robot/examples/Bluetooth_Control_Robot

Linter results for project: no errors or warnings

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

Linter results for projects: 1 ERRORS, 1 WARNINGS

[github-actions]

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