feat(deps): bump @tiptap/extension-placeholder from 2.1.6 to 2.1.13

Bumps [@tiptap/extension-placeholder](https://github.com/ueberdosis/tiptap/tree/HEAD/packages/extension-placeholder) from 2.1.6 to 2.1.13.
- [Release notes](https://github.com/ueberdosis/tiptap/releases)
- [Changelog](https://github.com/ueberdosis/tiptap/blob/v2.1.13/packages/extension-placeholder/CHANGELOG.md)
- [Commits](https://github.com/ueberdosis/tiptap/commits/v2.1.13/packages/extension-placeholder)

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

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

package.json

@@ -41,7 +41,7 @@
     "@tiptap/core": "^2.1.6",
     "@tiptap/extension-highlight": "^2.1.6",
     "@tiptap/extension-link": "^2.1.6",
-    "@tiptap/extension-placeholder": "^2.1.6",
+    "@tiptap/extension-placeholder": "^2.1.13",
     "@tiptap/extension-task-item": "^2.1.6",
     "@tiptap/extension-task-list": "^2.1.6",
     "@tiptap/extension-underline": "^2.1.6",