Update MbedTLS dependency to 4.x

Prerequisite Checklist

• I searched for existing issues to prevent duplicates
• I searched for existing discussions on the forum to prevent duplicates
• I understand SFML's scope and believe the feature fits it

Describe your feature request here

SFML currently uses MbedTLS 3, I would like to see it updated to use MbedTLS 4. A migration guide exists over in their repository: https://github.com/Mbed-TLS/mbedtls/blob/main/docs/4.0-migration-guide.md

Use Cases

I am trying to use MbedTLS 4.0 in my own code, however, since I statically link both SFML and MbedTLS in the same binary, this results in build failure.

API Example

N/A