deps(components): update @scion/components to Angular 18

BREAKING CHANGE: Updating `@scion/components` to Angular 18 introduced a breaking change.

To migrate:
- Update your application to Angular 18; for detailed migration instructions, refer to https://v18.angular.dev/update-guide;
- Deprecations introduced in version 16.2.0 have been removed:
  - SCION components now require the SCSS module `@scion/components` to be imported in `styles.scss`. See [SCION Design Tokens](https://github.com/SchweizerischeBundesbahnen/scion-toolkit/blob/master/docs/site/scion-design-tokens.md) for more information. Note that this step is not required if using `@scion/workbench` as imported by the SCION Workbench.
  - CSS variables of `sci-splitter` and `sci-sashbox` components have been replaced as follows:
    - `--sci-splitter-bgcolor` ➜ `--sci-splitter-background-color`
    - `--sci-splitter-bgcolor_hover` ➜ `--sci-splitter-background-color-hover`
    - `--sci-splitter-size_hover` ➜ `--sci-splitter-size-hover`
    - `--sci-splitter-opacity_active` ➜ `--sci-splitter-opacity-active`
    - `--sci-splitter-opacity_hover` ➜ `--sci-splitter-opacity-hover`
    - `--sci-sashbox-splitter-bgcolor` ➜ `--sci-sashbox-splitter-background-color`
    - `--sci-sashbox-splitter-size_hover` ➜ `--sci-sashbox-splitter-size-hover`
    - `--sci-sashbox-splitter-opacity_hover` ➜ `--sci-sashbox-splitter-opacity-hover`
    - `--sci-sashbox-splitter-bgcolor_hover` ➜ `--sci-sashbox-splitter-background-color-hover`
    - `--sci-sashbox-splitter-opacity_active` ➜ `--sci-sashbox-splitter-opacity-active`

.github/actions/equality-checker/action.yml

@@ -5,5 +5,5 @@ inputs:
     description: 'Comma-separated list of values to be checked for equality. The check is skipped if no values are given.'
     required: false
 runs:
-  using: 'node16'
+  using: 'node20'
   main: 'dist/index.js'