Update db/schema.rb

MSP-11615

To get type column on metasploit_credential_publics.

# Verification Steps

## Migrations
- [ ] `rake db:drop db:create db:migrate`
- [ ] `git status`
- [ ] VERIFY no changes to `db/schema.rb`

## specs
- [ ] `rake spec`
- [ ] VERIFY no failures due to change in `db/schema.rb`