[AE-158] Add Arduino_UnifiedStorage to repositories.txt

[aliphys]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/arduino-libraries/Arduino_UnifiedStorage:

Linting library in Arduino_UnifiedStorage
WARNING: library.properties name value Arduino_UnifiedStorage is longer than the recommended length of 16 characters.
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format      
         (Rule LP010)                                                                                                

Linter results for project: 0 ERRORS, 1 WARNINGS

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

Linting sketch in Arduino_UnifiedStorage/examples/AdvancedUSBInternalOperations

Linter results for project: no errors or warnings

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

Linting sketch in Arduino_UnifiedStorage/examples/BackupInternalPartitions

Linter results for project: no errors or warnings

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

Linting sketch in Arduino_UnifiedStorage/examples/SimpleStorageWriteRead

Linter results for project: no errors or warnings

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

Linter results for projects: 0 ERRORS, 1 WARNINGS

[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/arduino-libraries/Arduino_UnifiedStorage/

[aliphys]

The Linter has identified one WARNING which we will ignore. See: #3289 (comment)

The rule for library name length (LP010) has increased from 16 to 32. Once arduino/arduino-lint#511 is part of the arduino linter release, this warning will be eliminated.