chore: update url of "MP3 Player"

[Lesords]

No description provided.

[github-actions]

Hi @Lesords.
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/Seeed-Studio/Seeed_Serial_MP3_Player:

Linting library in Seeed_Serial_MP3_Player
INFO: No header file found matching library name (Seeed_Serial_MP3_Player.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 Seeed Serial MP3 Player 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)                                                                                                   
ERROR: Library name Seeed Serial MP3 Player 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)                                                                                                     

Linter results for project: 1 ERRORS, 1 WARNINGS

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

Linting sketch in Seeed_Serial_MP3_Player/examples/All_Terminal_player

Linter results for project: no errors or warnings

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

Linting sketch in Seeed_Serial_MP3_Player/examples/KT403A_Terminal_player

Linter results for project: no errors or warnings

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

Linting sketch in Seeed_Serial_MP3_Player/examples/WT2003S_Terminal_Player

Linter results for project: no errors or warnings

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

Linting sketch in Seeed_Serial_MP3_Player/examples/WT2605C_Terminal_Player

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 @Lesords
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

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/Seeed-Studio/Seeed_Serial_MP3_Player:

Linting library in Seeed_Serial_MP3_Player
INFO: No header file found matching library name (Seeed_Serial_MP3_Player.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 Seeed Serial MP3 Player 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)                                                                                                   

Linter results for project: 0 ERRORS, 1 WARNINGS

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

Linting sketch in Seeed_Serial_MP3_Player/examples/All_Terminal_player

Linter results for project: no errors or warnings

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

Linting sketch in Seeed_Serial_MP3_Player/examples/KT403A_Terminal_player

Linter results for project: no errors or warnings

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

Linting sketch in Seeed_Serial_MP3_Player/examples/WT2003S_Terminal_Player

Linter results for project: no errors or warnings

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

Linting sketch in Seeed_Serial_MP3_Player/examples/WT2605C_Terminal_Player

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/Seeed-Studio/Seeed_Serial_MP3_Player/