Merge branch '6.4' into 7.0

* 6.4:
  Update pull_requests.rst

Author: javiereguiluz

contributing/code/pull_requests.rst

@@ -31,7 +31,7 @@ Before working on Symfony, setup a friendly environment with the following
 software:
 
 * Git;
-* PHP version 7.2.5 or above.
+* PHP version 8.1 or above.
 
 Configure Git
 ~~~~~~~~~~~~~