[graphite] bump apiversion to v2 in order to support helm chart dependencies

[JonoNiemann]

What this PR does / why we need it:

• Support for apiversion 2, allowing use of dependencies in the chart.

Special notes for your reviewer:

Checklist

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

• [x] DCO signed
• [x] Chart Version bumped (if the pr is an update to an existing chart)
• [x] Title of the PR starts with chart name (e.g. [fluentd-elasticsearch])

[JonoNiemann]

cc: @monotek @rpahli

[JonoNiemann]

hey @rpahli

Would you mind taking a look or trying to rerun action...

the deploy step failed in actions

https://github.com/kiwigrid/helm-charts/actions/runs/5575998523/job/15098440124