chore(deps): update dependency find-unused-sass-variables to v5 (#76)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[find-unused-sass-variables](https://togithub.com/XhmikosR/find-unused-sass-variables)
| [`^4.0.5` ->
`^5.0.0`](https://renovatebot.com/diffs/npm/find-unused-sass-variables/4.1.0/5.0.0)
|
[![age](https://badges.renovateapi.com/packages/npm/find-unused-sass-variables/5.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/npm/find-unused-sass-variables/5.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/npm/find-unused-sass-variables/5.0.0/compatibility-slim/4.1.0)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/npm/find-unused-sass-variables/5.0.0/confidence-slim/4.1.0)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>XhmikosR/find-unused-sass-variables</summary>

###
[`v5.0.0`](https://togithub.com/XhmikosR/find-unused-sass-variables/releases/tag/v5.0.0)

[Compare
Source](https://togithub.com/XhmikosR/find-unused-sass-variables/compare/v4.1.0...v5.0.0)

#### What's Changed

- **BREAKING** Drop Node.js 12 support in
XhmikosR/find-unused-sass-variables@8470fe8
- **BREAKING** Switch to named exports in
XhmikosR/find-unused-sass-variables@5c0805c
and
XhmikosR/find-unused-sass-variables@e93a36d
- Improve CLI in
[https://github.com/XhmikosR/find-unused-sass-variables/pull/235](https://togithub.com/XhmikosR/find-unused-sass-variables/pull/235)

**Full Changelog**:
XhmikosR/find-unused-sass-variables@v4.1.0...v5.0.0

</details>

---

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