Fix ruff errors (#8936)

* Fix ruff errors

Renamed neural_network/input_data.py to neural_network/input_data.py_tf
because it should be left out of the directory for the following
reasons:

1. Its sole purpose is to be used by neural_network/gan.py_tf, which is
   itself left out of the directory because of issues with TensorFlow.

2. It was taken directly from TensorFlow's codebase and is actually
   already deprecated. If/when neural_network/gan.py_tf is eventually
   re-added back to the directory, its implementation should be changed
   to not use neural_network/input_data.py anyway.

* updating DIRECTORY.md

* Change input_data.py_tf file extension

Change input_data.py_tf file extension because algorithms-keeper bot is being picky about it

---------

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

maths/numerical_integration.py

@@ -7,9 +7,9 @@ from collections.abc import Callable
 
 
 def trapezoidal_area(
-    fnc: Callable[[int | float], int | float],
-    x_start: int | float,
-    x_end: int | float,
+    fnc: Callable[[float], float],
+    x_start: float,
+    x_end: float,
     steps: int = 100,
 ) -> float:
     """