build(deps): update dependency ngx-countdown to v15 (main)

[angular-robot]

This PR contains the following updates:

Package	Type	Update	Change
ngx-countdown (source)	dependencies	major	14.0.0 -> 15.0.0

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Release Notes

cipchk/ngx-countdown

### [`v15.0.0`](https://togithub.com/cipchk/ngx-countdown/releases/tag/15.0.0) [Compare Source](https://togithub.com/cipchk/ngx-countdown/compare/14.0.0...15.0.0) - Bump angular to `15`

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Configuration

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