fix: API/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-KERAS-13743411
- https://snyk.io/vuln/SNYK-PYTHON-KERAS-13786416

Author: snyk-bot

API/requirements.txt

@@ -1,6 +1,6 @@
 deepface==0.0.92
 fastapi==0.115.0
-keras==2.15.0
+keras==3.12.0
 matplotlib==3.8.2
 numpy==2.1.2
 Pillow==10.4.0