Add void return type to all procedural alter hook implementations

I converted one of these so there is a conflict.

Also I need to create an issue to convert the profiles.

Also don't convert here most of these are intentional.

Looks good now!

Not really a follow up, but I created the profile issue here: 📌 Convert profile hooks Active

Aside from reading the MR I confirmed all the alters were fixed by checking how many there are on HEAD

$ git grep -A2 'Implements hook' | grep function.*alter | wc -l
52

With the number with 'void'

$ git grep -A2 'Implements hook' | grep function.*alter | grep void | wc -l
52