pre-commit: Upgrade psf/black for stable style 2023 (#8110)

* pre-commit: Upgrade psf/black for stable style 2023

Updating https://github.com/psf/black ... updating 22.12.0 -> 23.1.0 for their `2023 stable style`.
* https://github.com/psf/black/blob/main/CHANGES.md#2310

> This is the first [psf/black] release of 2023, and following our stability policy, it comes with a number of improvements to our stable style…

Also, add https://github.com/tox-dev/pyproject-fmt and https://github.com/abravalheri/validate-pyproject to pre-commit.

I only modified `.pre-commit-config.yaml` and all other files were modified by pre-commit.ci and psf/black.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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

project_euler/problem_004/sol1.py

@@ -32,12 +32,10 @@ def solution(n: int = 998001) -> int:
 
     # fetches the next number
     for number in range(n - 1, 9999, -1):
-
         str_number = str(number)
 
         # checks whether 'str_number' is a palindrome.
         if str_number == str_number[::-1]:
-
             divisor = 999
 
             # if 'number' is a product of two 3-digit numbers