showcase: update angular versions in homepage

[SuperITMan]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[X] Bug report  
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/NationalBankBelgium/stark/blob/master/CONTRIBUTING.md#got-a-question-or-problem

Current behavior

https://stark.nbb.be is running on Angular 16 but the homepage shows "Angular 7"

Expected behavior

The displayed versions should reflect the current status of the dependencies (16.x).

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Provide correct information.

Environment

Angular version: 16.x
Stark version: 12.x


Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others: