feat(Dependencies): Update dependency ngx-scrollbar to v15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ngx-scrollbar (source)	13.0.3 -> 15.1.2

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Release Notes

MurhafSousli/ngx-scrollbar (ngx-scrollbar)

v15.1.2

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• Set the latest fixed polyfill CDN as default.
• Update Typescript to v5.5.4, closes #​633.

v15.1.1

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• Fix scroll-timeline polyfill errors, closes #​631, #​624, #​594 and #​590.

v15.1.0

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• feat: Add a new option hoverOffset to activate hover effect on the offset area around the scrollbar, closes #​616.
• fix: Scrollbar thumb color is not changing on hover, closes #​625.

v15.0.4

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• fix: global Angular app styles gets broken in Firefox, closes #​615.

v15.0.3

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• feat: Ability to set the scrollbar CSS variables from :root or any parent selector, closes #​591 and #​606.

v15.0.1

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• fix: SSR with CDK Virtual Scroll - ResizeObserver is not defined error thrown, closes #​603.
• regret: Remove the requestAnimationFrame before emitting to afterInit and afterUpdate which was added to fix the unit tests.

This was not a bug or an issue in the previous version v15.0.0

v15.0.0

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• feat: Upgrade to Angular 18.

v14.1.1

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• feat: Ship the scroll timeline polyfill with the package.
• fix: Content Security Policy violation for script-src, closes #​572.

v14.1.0

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• fix: cdkVirtualScrollViewport got dependency of @​angular/material/select, closes in #​573.
• fix: cdkVirtualScrollViewport horizontal scrollbar not showing when orientation is vertical, closes in #​571.
• fix: ScrollToElement function wrong scroll position, closes in #​574.
• fix: Remove height and width attributes from the scrollbar SVG icons.

Breaking changes

• Remove ngx-scrollbar/utils package and split its directives into 2 sub-packages ngx-scrollbar/cdk and ngx-scrollbar/mat to avoid wrong dependency.

v14.0.0

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• fix: Scrollbar buttons - arrow icons are not being displayed in Safari mobile.

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