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/polynomials/single_indeterminate_operations.py

@@ -87,7 +87,7 @@ class Polynomial:
 
         return Polynomial(self.degree + polynomial_2.degree, coefficients)
 
-    def evaluate(self, substitution: int | float) -> int | float:
+    def evaluate(self, substitution: float) -> float:
         """
         Evaluates the polynomial at x.
         >>> p = Polynomial(2, [1, 2, 3])
@@ -144,7 +144,7 @@ class Polynomial:
             coefficients[i] = self.coefficients[i + 1] * (i + 1)
         return Polynomial(self.degree - 1, coefficients)
 
-    def integral(self, constant: int | float = 0) -> Polynomial:
+    def integral(self, constant: float = 0) -> Polynomial:
         """
         Returns the integral of the polynomial.
         >>> p = Polynomial(2, [1, 2, 3])