chore(deps): update dependency cssnano to v7 (#5755)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [cssnano](https://togithub.com/cssnano/cssnano) | [`^6.0.1` ->
`^7.0.0`](https://renovatebot.com/diffs/npm/cssnano/6.1.2/7.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/cssnano/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/cssnano/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/cssnano/6.1.2/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/cssnano/6.1.2/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v7.0.0`](https://togithub.com/cssnano/cssnano/compare/cssnano-preset-advanced@6.1.2...cssnano-preset-advanced@7.0.0)

[Compare
Source](https://togithub.com/cssnano/cssnano/compare/cssnano@6.1.2...cssnano@7.0.0)

</details>

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package.json

@@ -65,7 +65,7 @@
     "@ui5/webcomponents-tools": "1.24.0",
     "@vitejs/plugin-react": "^4.2.0",
     "chromatic": "^11.0.0",
-    "cssnano": "^6.0.1",
+    "cssnano": "^7.0.0",
     "cypress": "^13.0.0",
     "cypress-real-events": "^1.8.1",
     "dedent": "^1.0.0",