Update dependency sass to v1.63.4 (#90)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [sass](https://togithub.com/sass/dart-sass) | [`1.63.3` ->
`1.63.4`](https://renovatebot.com/diffs/npm/sass/1.63.3/1.63.4) |
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|
[![adoption](https://badges.renovateapi.com/packages/npm/sass/1.63.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/npm/sass/1.63.4/compatibility-slim/1.63.3)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/npm/sass/1.63.4/confidence-slim/1.63.3)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>sass/dart-sass</summary>

###
[`v1.63.4`](https://togithub.com/sass/dart-sass/blob/HEAD/CHANGELOG.md#&#8203;1634)

[Compare
Source](https://togithub.com/sass/dart-sass/compare/1.63.3...1.63.4)

##### JavaScript API

- Re-enable support for `import sass from 'sass'` when loading the
package from
an ESM module in Node.js. However, this syntax is now deprecated; ESM
users
    should use `import * as sass from 'sass'` instead.

On the browser and other ESM-only platforms, only `import * as sass from
    'sass'` is supported.

- Properly export the legacy API values `TRUE`, `FALSE`, `NULL`, and
`types` from
    the ECMAScript module API.

##### Embedded Sass

- Fix a race condition where closing standard input while requests are
in-flight
    could sometimes cause the process to hang rather than shutting down
    gracefully.

- Properly include the root stylesheet's URL in the set of loaded URLs
when it
    fails to parse.

</details>

---

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