[Docs Site] Bump @expressive-code/plugin-collapsible-sections

Bumps [@expressive-code/plugin-collapsible-sections](https://github.com/expressive-code/expressive-code/tree/HEAD/packages/@expressive-code/plugin-collapsible-sections) from 0.38.3 to 0.39.0.
- [Release notes](https://github.com/expressive-code/expressive-code/releases)
- [Changelog](https://github.com/expressive-code/expressive-code/blob/main/packages/@expressive-code/plugin-collapsible-sections/CHANGELOG.md)
- [Commits](https://github.com/expressive-code/expressive-code/commits/@expressive-code/[email protected]/packages/@expressive-code/plugin-collapsible-sections)

---
updated-dependencies:
- dependency-name: "@expressive-code/plugin-collapsible-sections"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -37,7 +37,7 @@
 		"@cloudflare/vitest-pool-workers": "^0.6.0",
 		"@cloudflare/workers-types": "^4.20241218.0",
 		"@codingheads/sticky-header": "^1.0.2",
-		"@expressive-code/plugin-collapsible-sections": "^0.38.3",
+		"@expressive-code/plugin-collapsible-sections": "^0.39.0",
 		"@iarna/toml": "^2.2.5",
 		"@iconify-json/material-symbols": "^1.2.12",
 		"@stoplight/json-schema-tree": "^4.0.0",