chore(deps-dev): bump cssnano from 5.0.15 to 5.0.16 (mermaid-js#622)

Bumps [cssnano](https://github.com/cssnano/cssnano) from 5.0.15 to 5.0.16.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/[email protected]@5.0.16)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -23,7 +23,7 @@
 		"@typescript-eslint/parser": "^4.33.0",
 		"autoprefixer": "^10.4.2",
 		"chai": "^4.3.4",
-		"cssnano": "^5.0.15",
+		"cssnano": "^5.0.16",
 		"cypress": "9.3.1",
 		"cypress-localstorage-commands": "^1.6.1",
 		"eslint": "^7.32.0",