Update repositories.txt

[dantudose]

Added library for the Lite-On LTR308 ALS IC

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/dantudose/LTR308:

Linting library in LTR308
INFO: No header file found matching library name (LTR308_library.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)                                                                                                      
WARNING: library.properties name LTR308 library contains spaces. Although supported, best practices is to not use       
         spaces.                                                                                                        
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP015)                                                                                                   
WARNING: Library name LTR308 library contains "library". This is superfluous.                                  
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP016)                                                                                          
WARNING: library.properties version value 1.0 is not compliant with the semver specification.
         See: https://semver.org/                                                            
         (Rule LP021)                                                                        

Linter results for project: 0 ERRORS, 3 WARNINGS

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

Linting sketch in LTR308/examples/LTR308Example

Linter results for project: no errors or warnings

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

Linter results for projects: 0 ERRORS, 3 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/dantudose/LTR308/