[charts/portal] Portal ngnix ingress bump

Description of the change

ingress ngnix upgrade to 4.7.2 Benefits

1.26+ k8s support

Drawbacks

Applicable issues

Additional information

Checklist

[X] Chart version bumped in Chart.yaml according to semver.
[X] Variables are documented in the README.md
[X] Title of the PR starts with chart name (e.g. [charts/gateway])
[X] If the chart contains a values-production.yaml apart from values.yaml, ensure that you implement the changes in both files

CAAPIM / apim-charts