chore(deps): update dependency cssnano to v7.1.3 (#488)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [cssnano](https://redirect.github.com/cssnano/cssnano) | [`7.1.2` →
`7.1.3`](https://renovatebot.com/diffs/npm/cssnano/7.1.2/7.1.3) |
![age](https://developer.mend.io/api/mc/badges/age/npm/cssnano/7.1.3?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/cssnano/7.1.2/7.1.3?slim=true)
|

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### Release Notes

<details>
<summary>cssnano/cssnano (cssnano)</summary>

###
[`v7.1.3`](https://redirect.github.com/cssnano/cssnano/releases/tag/cssnano%407.1.3):
v7.1.3

#### What's Changed

- Optimize mergeRule selector merging with WeakMap caching by
[@&#8203;Goodwine](https://redirect.github.com/Goodwine) in
[#&#8203;1748](https://redirect.github.com/cssnano/cssnano/pull/1748)

**Full Changelog**:
<https://github.com/cssnano/cssnano/compare/cssnano@7.1.2...cssnano@7.1.3>

</details>

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