fix: 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

requirements.txt

@@ -1,5 +1,5 @@
 apyori==1.1.2
-Keras==2.4.3
+Keras==3.12.0
 Keras-Preprocessing==1.1.2
 nltk==3.5
 numpy==1.18.5