[gcloud-sqlproxy] HPA kind Fix case sensitive StatefulSet

[tasnyc]

… sensitive StatefulSet #142

What this PR does / why we need it:

Which issue this PR fixes : fixes #142

Special notes for your reviewer: Stupid mistake by me in last PR since it looks like kind is case sensitive. Changed from Statefulset to StatefulSet. I do not believe this needs a version bump. Should remain 0.25.5 but it looks like don't have an option to just patch 0.25.5 so bumped version Again, sorry about this, this was actually my first PR to a public repo.

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] Chart Version bumped, is mandatory for any chart chnages
• [x] Title of the PR starts with chart name (e.g. [gcloud-sqlproxy])

[tasnyc]

Instead of making a new version 0.25.6 .. if can just updated 0.25.5 that would be better.

[tasnyc]

By any chance will this get merged or are you waiting to include it in the next version ?