chore: bump the development-dependencies group with 4 updates (#105)

Bumps the development-dependencies group with 4 updates: [highcharts](https://github.com/highcharts/highcharts-dist), [rollup](https://github.com/rollup/rollup), [rollup-plugin-css-only](https://github.com/thgh/rollup-plugin-css-only) and [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte).


Updates `highcharts` from 12.3.0 to 12.4.0
- [Commits](highcharts/highcharts-dist@v12.3.0...v12.4.0)

Updates `rollup` from 4.50.0 to 4.50.1
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v4.50.0...v4.50.1)

Updates `rollup-plugin-css-only` from 4.5.2 to 4.5.5
- [Release notes](https://github.com/thgh/rollup-plugin-css-only/releases)
- [Changelog](https://github.com/thgh/rollup-plugin-css-only/blob/v4/CHANGELOG.md)
- [Commits](thgh/rollup-plugin-css-only@v4.5.2...v4.5.5)

Updates `svelte` from 5.38.6 to 5.38.7
- [Release notes](https://github.com/sveltejs/svelte/releases)
- [Changelog](https://github.com/sveltejs/svelte/blob/main/packages/svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/svelte/commits/[email protected]/packages/svelte)

---
updated-dependencies:
- dependency-name: highcharts
  dependency-version: 12.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: rollup
  dependency-version: 4.50.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
- dependency-name: rollup-plugin-css-only
  dependency-version: 4.5.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
- dependency-name: svelte
  dependency-version: 5.38.7
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]