charts/gateway bumped version

Description of the change

Benefits

Possible 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