Fix code style in README.md (#12843)

* Fix #12840 code style

* Update README.md

---------

Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>

Author: chandrapola

README.md

@@ -27,8 +27,8 @@
   <a href="https://github.com/pre-commit/pre-commit">
     <img src="https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white&style=flat-square" height="20" alt="pre-commit">
   </a>
-  <a href="https://github.com/psf/black">
-    <img src="https://img.shields.io/static/v1?label=code%20style&message=black&color=black&style=flat-square" height="20" alt="code style: black">
+  <a href="https://docs.astral.sh/ruff/formatter/">
+    <img src="https://img.shields.io/static/v1?label=code%20style&message=ruff&color=black&style=flat-square" height="20" alt="code style: black">
   </a>
 <!-- Short description: -->
   <h3>All algorithms implemented in Python - for education</h3>