fix tensorflow/keras vulnerability

[edoardoscarpaci]

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Proposed changes:

• update tensorflow from 2.12 to 2.14 to fix keras critical CVE-2024-3660 and other major vulnerabilities on tensorflow and transformers

Status (please check what you already did):

• [ ] added some tests for the functionality
• [ ] updated the documentation
• [ ] updated the changelog (please check changelog for instructions)
• [ ] reformat files using black (please check Readme for instructions)

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