Change password request from put to post request

[Temake]

Change password request from put to post request

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Description

This pull request updates the change password API route in api/v1/routes/auth.py to follow RESTful best practices. Previously, the route used PUT, which is intended for idempotent updates. However, changing a password is an action-based operation, making POST the more appropriate HTTP method.

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Related Issue (Link to issue ticket)

#1238

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Motivation and Context

The current PUT method is inconsistent with common REST API convention.

• POST is preferred for actions like password changes, which are not idempotent.
• POST signals to integrators that this is a special action, not a regular update.
• This change also aligns with security best practices for sensitive operations like password changes.

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How Has This Been Tested?

I wrote unit tests to automatically test the fix works as expected
I also tested it manually on postman and got the expected response
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Screenshots (if appropriate - Postman, etc):

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Types of changes

• [ x] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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Checklist:

• [x ] My code follows the code style of this project.
• [x ] My change requires a change to the documentation.
• [ x] I have updated the documentation accordingly.
• [ x] I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• [ x] All new and existing tests passed.