fix: use bcrypt for password hashing in user authentication

[JulesGresset]

Describe your changes

Password is hashed in the backend

How to test the feature

Try to connect with the login route with a clear password.

Issue ticket number and link

Closes #169

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• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
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• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Documentation has been updated as required
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