Fix exception type in upgrade snapshot

[demeritcowboy]

Overview

This was just merged in #25420 but it's not the right type.

Before

No exceptions get caught.

After

Puts it back like it was before #25420 where exceptions get caught.

Technical Details

There's only a handful of things that can go wrong in this query:

1. DB error => PEAR_Exception
2. Aliens arrive and are friendly, in which case will have an advanced version of civi you can use instead.
3. Aliens arrive and are not friendly, in which case you will have more important things to worry about than upgrading civi.

Comments

[civibot]

(Standard links)

• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[eileenmcnaughton]

thanks @demeritcowboy