Grant all privileges to release user

- Migrations require things like DROP and INDEX and I was missing these previously
- Granting ALL seems okay, as long as you don't have *business critical* enterprise databases that start with 'release'
Merge pull request #57 from alphagov/mysql_index

Grant all privileges to release user
bundle update
Upgrade gds sso to 9.2.5
Remove deprecated parameters from sso initializer

- It appears these properties got dropped a few versions back
- Removing them doesn't cause any problems in dev, but I worry... I worry.