chore(deps): update dependency cssnano to v8 (#8569)

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) | [`7.1.9` →
`8.0.0`](https://renovatebot.com/diffs/npm/cssnano/7.1.9/8.0.0) |
![age](https://developer.mend.io/api/mc/badges/age/npm/cssnano/8.0.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/cssnano/7.1.9/8.0.0?slim=true)
|

---

### Release Notes

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

###
[`v8.0.0`](https://redirect.github.com/cssnano/cssnano/releases/tag/cssnano%408.0.0):
v8.0.0

[Compare
Source](https://redirect.github.com/cssnano/cssnano/compare/cssnano@7.1.9...cssnano@8.0.0)

#### What's Changed

- Move declaration sorter to advanced preset by
[@&#8203;ludofischer](https://redirect.github.com/ludofischer) and
[@&#8203;Goodwine](https://redirect.github.com/Goodwine) in
[#&#8203;1793](https://redirect.github.com/cssnano/cssnano/pull/1793)
- Drop node 20 by
[@&#8203;ludofischer](https://redirect.github.com/ludofischer) in
[#&#8203;1794](https://redirect.github.com/cssnano/cssnano/pull/1794)

**Full Changelog**:
<https://github.com/cssnano/cssnano/compare/cssnano@7.1.9...cssnano@8.0.0>

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/UI5/webcomponents-react).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xNTkuMiIsInVwZGF0ZWRJblZlciI6IjQzLjE1OS4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -79,7 +79,7 @@
     "@ui5/webcomponents-tools": "2.21.1",
     "@vitejs/plugin-react": "6.0.1",
     "chromatic": "16.9.1",
-    "cssnano": "7.1.9",
+    "cssnano": "8.0.0",
     "cypress": "15.14.2",
     "cypress-real-events": "1.15.0",
     "dedent": "1.7.2",