Bump @tiptap/starter-kit from 2.1.7 to 2.1.8

Bumps [@tiptap/starter-kit](https://github.com/ueberdosis/tiptap/tree/HEAD/packages/starter-kit) from 2.1.7 to 2.1.8.
- [Release notes](https://github.com/ueberdosis/tiptap/releases)
- [Changelog](https://github.com/ueberdosis/tiptap/blob/v2.1.8/packages/starter-kit/CHANGELOG.md)
- [Commits](https://github.com/ueberdosis/tiptap/commits/v2.1.8/packages/starter-kit)

---
updated-dependencies:
- dependency-name: "@tiptap/starter-kit"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -39,7 +39,7 @@
         "@tiptap/extension-text-align": "^2.0.3",
         "@tiptap/extension-underline": "^2.0.3",
         "@tiptap/pm": "^2.0.3",
-        "@tiptap/starter-kit": "^2.0.3",
+        "@tiptap/starter-kit": "^2.1.8",
         "@tiptap/vue-3": "^2.0.3",
         "@vitejs/plugin-vue": "^4.0.0",
         "dompurify": "^3.0.4",