how to change php version on git hub codespace?

I am working on the codespace on some PHP-based code. when I am running this command:

php --ini

Configuration File (php.ini) Path: /opt/php/8.2.4/iniLoaded Configuration File:         /opt/php/8.2.4/ini/php.iniScan for additional .ini files in: /opt/php/8.2.4/ini/conf.dAdditional .ini files parsed:      (none)

So I install PHP v7.4 by using this command:

sudo apt install php7.4-common

and when I am trying to update-alternatives --config php it says:

There is only one alternative in link group php (providing /usr/bin/php): /usr/bin/php7.4Nothing to configure.

but my code has some dependencies on php7.4 and still I cannot run my code completly.7the php --ini command also returns the same result.

the php --version returns PHP 8.2.4