Upgrading from 4.1.9 to 4.2.0 issues

Hello Everyone, I would like to upgrade my CI from 4.1.9 to 4.2.4 as well as PHP if its required. 

I have installed the CI CMD tool

Code:

composer create-project codeigniter4/appstarter 

My CI Version is 

Code:

CodeIgniter v4.1.9 Command Line Tool - Server Time: 2022-08-15 20:12:37 UTC-05:00

My PHP Version is

Code:

PHP 7.3.5 (cli) (built: May  1 2019 13:17:17) ( ZTS MSVC15 (Visual C++ 2017) x64 )

I tried 

Code:

composer update
i get return as Nothing to install or update

Mandatory File Changes
I have upgraded the thease files from 
public/index.php  // https://github.com/codeigniter4/CodeIgniter4/blob/v4.2.0/public/index.php
spark //https://github.com/codeigniter4/CodeIgniter4/blob/v4.2.0/spark

I run again composer update same response as Nothing to install or update and when i run the app php spark serve
I got this error

Call to undefined method CodeIgniter\CodeIgniter::setContext()

at ROOTPATH\spark:72

looking at :https://packagist.org/packages/codeigniter4/framework

its alluding to php being 7.4 and above

One of the reasons i moved from slackware linux ( before 15.0) to Arch

The shift from php 7.3 to 7.4 seems to be between 4.1.9 to 4.2.0

CMS CI4     I use Arch Linux by the way