chore: add Ewan-Dev/mpu6050 library to repositories.txt

[Ewan-Dev]

This is to add my MPU6050 library to the Arduino library index.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/Ewan-Dev/mpu6050:

Linting library in mpu6050
WARNING: library.properties depends field item(s) Wire not found in the Library Manager index.                 
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP048)                                                                                          

Linter results for project: 0 ERRORS, 1 WARNINGS

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Linting sketch in mpu6050/examples/actual-angle-values

Linter results for project: no errors or warnings

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Linting sketch in mpu6050/examples/basic-processed

Linter results for project: no errors or warnings

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Linting sketch in mpu6050/examples/complementary-filtered-angles

Linter results for project: no errors or warnings

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Linting sketch in mpu6050/examples/raw-values

Linter results for project: no errors or warnings

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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/Ewan-Dev/mpu6050/