Misc fixes across multiple algorithms (#6912)

Source: Snyk code quality
Add scikit-fuzzy to requirements

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>

maths/extended_euclidean_algorithm.py

@@ -75,11 +75,12 @@ def main():
     """Call Extended Euclidean Algorithm."""
     if len(sys.argv) < 3:
         print("2 integer arguments required")
-        exit(1)
+        return 1
     a = int(sys.argv[1])
     b = int(sys.argv[2])
     print(extended_euclidean_algorithm(a, b))
+    return 0
 
 
 if __name__ == "__main__":
-    main()
+    raise SystemExit(main())