doc(README): command to launch tests was incorrect

[Psycojoker]

No description provided.

[github-actions]

Summary:
The PR involves a minor change in the README file. The diff shows a typo correction from hatch run test:run to hatch run testing:run. This change is likely to be a straightforward correction and does not introduce any significant new features, modifications to existing logic, or extensive changes that could potentially introduce bugs.

Highlighting relevant parts of the diff:

diff --git a/README.md b/README.md
index cfc7e1a4..3d2aea9c 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ $ pip install -e .[all]
 You can use the test env defined for hatch to run the tests:
 
 ```shell
-$ hatch run test:run
+$ hatch run testing:run

This change is purely a typo correction and does not affect the functionality of the codebase, nor does it introduce any substantial risks. Therefore, it is categorized as 'BLUE'.