[TECHNICAL] Improve biometrical authentication security

[Aitorbp]

Related Issues

App: https://github.com/owncloud/android/issues/4180

• [x] Added changelog files for the fixed issues in folder changelog/unreleased. More info here

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QA

[JuancaG05]

Closing this, the code developed here is not useful, will be replaced by other PR for this issue