Zend certified PHP/Magento developer

Magento: 500 Internal Server Error after upgrading to 2.4.4

The store front shows 500 Internal server error after I followed all instructions in the article here to upgrade Magento. On checking the version of Magento with the command bin/magento --version after the upgrade process, I see this old version.

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Running git status shows what’s seen in the image below.

I’m not sure if Magento upgrade went fine. Could you please help me fix 500 Internal Server error?