chore: updated the git repository's tag referenced in base to match the current tag/chart version

This prevents the need for users of this base to update the gitrepository in their Kustomize file:

patchesStrategicMerge:
- |-
  apiVersion: source.toolkit.fluxcd.io/v1beta1
  kind: GitRepository
  metadata:
    name: bigbang
    namespace: bigbang
  spec:
    ref:
      $patch: replace
      semver: "1.0.2"