[`Docs`] Update a link (#6014)

* Update the location of Python's version

* Trim trailing whitespace

CONTRIBUTING.md

@@ -355,7 +355,7 @@ You will need basic `git` proficiency to be able to contribute to
 manual. Type `git --help` in a shell and enjoy. If you prefer books, [Pro
 Git](https://git-scm.com/book/en/v2) is a very good reference.
 
-Follow these steps to start contributing ([supported Python versions](https://github.com/huggingface/diffusers/blob/main/setup.py#L244)):
+Follow these steps to start contributing ([supported Python versions](https://github.com/huggingface/diffusers/blob/main/setup.py#L265)):
 
 1. Fork the [repository](https://github.com/huggingface/diffusers) by
 clicking on the 'Fork' button on the repository's page. This creates a copy of the code

Makefile

@@ -41,7 +41,7 @@ repo-consistency:
 
 quality:
 	ruff check $(check_dirs) setup.py
-	ruff format --check $(check_dirs) setup.py 
+	ruff format --check $(check_dirs) setup.py
 	python utils/check_doc_toc.py
 
 # Format source code automatically and check is there are any problems left that need manual fixing