Update `BarChart` to work with latest `apexcharts` update

[infomiho]

Users reported in Discord Typescript errors when using the latest Open SaaS:

It's due to ApexCharts library we use for our charts made a breaking change in their types (removed the radius property we used in the options) but they bumped their version as a minor change: v3.50.0 -> v3.51.0 instead of major change so npm installed the next minor by default.

How we could fix it:

• We could update the template not to use the radius property.
• We could use a specific version of ApexCharts to prevent uncontrolled version bumps.

Reported to ApexCharts here: https://github.com/apexcharts/apexcharts.js/issues/4580

[vincanger]

ok @infomiho I removed the radius property as it wasn't really necessary anyway and BarChart is just an unused example chart we ship with it. This should be enough for now