Bump rector/rector dependency to ^2.3.1

[DerManoMann]

No description provided.

[github-actions]

Created backport PR for 5.x:

• [Backport #1913 to 5.x] Bump rector/rector dependency to ^2.3.1 #1914 with remaining conflicts!

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-1913-to-5.x
git worktree add --checkout .worktree/backport-1913-to-5.x backport-1913-to-5.x
cd .worktree/backport-1913-to-5.x
git reset --hard HEAD^
git cherry-pick -x 18147e416135d9bdc237c62670c985a93c52ece7
git push --force-with-lease