Missing message template updates
I had noticed a missing handful earlier and added it to https://github.com/civicrm/civicrm-core/blob/0ebeb224903925880f3ad0ddacd4e90470049839/CRM/Upgrade/Incremental/MessageTemplates.php#L252, but I'm noticing a few more seem to be out of date. I'll try to reconcile.
It's technically a regression but at first glance they all seem to just be php8 updates, nothing functional.
A bigger project: Why does the upgrade work the way it does and why does it need this list to be manually updated? Why doesn't it just compare the default version in the database to what's on disk, and update it if different? Why does it even need a default version in the database anyway - maybe just because it makes Revert code easier?