Hello Katie a cpanel is where you can control your website from your web host side….make sure your system php version is the same as the as the one you set for your domain. I had a similar error and that’s how I solved it for me..Steps below
1-Log into your cpanel
2-Go to software section
3- Select PHP Version you want
4-Reload your website ,if it still returns the error
4-Go back to the software section
5-This time select Multiphp manager section and select your domain
6-Select your php version on the same page as inherit
Hope that works for you too
your wordpress update seems to conflict with your php version
Update your php in the cpanel to 7.3 or above
