Bump @tiptap/extension-highlight from 3.17.1 to 3.18.0

Bumps [@tiptap/extension-highlight](https://github.com/ueberdosis/tiptap/tree/HEAD/packages/extension-highlight) from 3.17.1 to 3.18.0.
- [Release notes](https://github.com/ueberdosis/tiptap/releases)
- [Changelog](https://github.com/ueberdosis/tiptap/blob/develop/packages/extension-highlight/CHANGELOG.md)
- [Commits](https://github.com/ueberdosis/tiptap/commits/v3.18.0/packages/extension-highlight)

---
updated-dependencies:
- dependency-name: "@tiptap/extension-highlight"
  dependency-version: 3.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -16,7 +16,7 @@
     },
     "dependencies": {
         "@tiptap/core": "^3.10.7",
-        "@tiptap/extension-highlight": "^3.10.7",
+        "@tiptap/extension-highlight": "^3.18.0",
         "@tiptap/extension-image": "^3.10.7",
         "@tiptap/extension-link": "^3.10.7",
         "@tiptap/extension-subscript": "^3.10.7",