[secrets-store-csi-driver-provider-gcp] Chart fixes and updates

[milesarmstrong]

What this PR does / why we need it:

• Fixes a chart rendering error in a few templates, the -}} just before the start of the resource template chomps the newline and means the apiVersion field of the resource ends up as part of the header comment.
  • pre fix:

    ➜  helm template . -f values.yaml | kubeconform -kubernetes-version "1.27.8" -summary -ignore-missing-schemas -schema-location default
    stdin - ServiceAccount release-name-secrets-store-csi-driver-provider-gcp failed validation: error while parsing: missing 'apiVersion' key
    stdin - ClusterRole release-name-secrets-store-csi-driver-provider-gcp failed validation: error while parsing: missing 'apiVersion' key
    stdin - ClusterRoleBinding release-name-secrets-store-csi-driver-provider-gcp failed validation: error while parsing: missing 'apiVersion' key
    Summary: 4 resources found parsing stdin - Valid: 1, Invalid: 0, Errors: 3, Skipped: 0

  • post fix:

    ➜  helm template . -f values.yaml | kubeconform -kubernetes-version "1.27.8" -summary -ignore-missing-schemas -schema-location default
    Summary: 4 resources found parsing stdin - Valid: 4, Invalid: 0, Errors: 0, Skipped: 0

• Bump the default application version to 1.5.0
• Bring the various security improvements that have been added to the Chart in the application repo

Which issue this PR fixes

N/A

Special notes for your reviewer:

• The mountpoint-dir volume is no longer needed since v1.0.0 of the application

Checklist

• [x] Title of the PR starts with chart name (e.g. [portefaix-kyverno])
• [x] Documentation has been updated with helm-docs (run: .github/helm-docs.sh)
• [x] Chart Version bumped
• [x] Variables are documented in the README.md

[milesarmstrong]

Hi @nlamirault, please could you review this change!

[milesarmstrong]

@nlamirault thanks for the merge!

Looks like the release on master failed due to an issue with re-releasing kubewarden: https://github.com/portefaix/portefaix-hub/actions/runs/8300331483/job/22718025094#step:7:86

[nlamirault]

done.