Update Chart.yaml to be Helm 3 compatible (apiVersion: v2)

Our Chart.yaml is currently using apiVersion:v1. We need to update this to apiVersion:v2 to be Helm 3 compatible

https://helm.sh/docs/topics/charts/#the-apiversion-field

Changes from v1 to v2:

• A dependencies field defining chart dependencies, which were located in a separate requirements.yaml file for v1 charts (see Chart Dependencies).
• The type field, discriminating application and library charts (see Chart Types).

See also

• An example where Helm v3 was used with auto-deploy-app, which caused an issue: gitlab-org/cluster-integration/auto-deploy-image@3fb943be (comment 277053965)