chore(demo, components-angular): Upgrade to Angular 16

[imagoiq]

### Tasks
- [x] Follow [angular update guide](https://update.angular.io/?v=15.0-16.0)
- [x] Check [changelog from ng-packagr](https://github.com/ng-packagr/ng-packagr/blob/HEAD/CHANGELOG.md#1600-2023-05-03)
- [x] Check [changelog from ng-bootstrap](https://github.com/ng-bootstrap/ng-bootstrap/blob/HEAD/CHANGELOG.md#1500-2023-05-25)
- [x] Check [changelog from ngx-highlightjs](https://togithub.com/murhafsousli/ngx-highlightjs/blob/HEAD/CHANGELOG.md#900)

components-angular (no changes)

PRs

close #1914 close #1913 close #1912 close #1911 close #1901

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 2f629aba5b15bcde8cc162676d298d640e9cfe8e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | ------------------------------------------- | ----- | | @swisspost/design-system-components-angular | Major | | @swisspost/design-system-intranet-header | Major | | @swisspost/design-system-demo | Major |

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[swisspost-bot]

Preview environment ready: https://preview-1920--swisspost-web-frontend.netlify.app

[imagoiq]

@oliverschuerch @alizedebray @gfellerph All looks good to me, I'm not sure what else I should look, but I'm sure you have ideas 😉

[imagoiq]

@gfellerph I think it's ready to be released as beta. I'll let you do it as I don't know how to do it.

[imagoiq]

I created an Angular 16 app from scratch and integrated the component. I didn't see any issue.

[gfellerph]

I created an Angular 16 app from scratch and integrated the component. I didn't see any issue.

Nice, I'll give it a try as well, then we can decide on the version bump.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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