fix: upgrade @tiptap/extension-placeholder from 2.26.1 to 2.27.1

Snyk has created this PR to upgrade @tiptap/extension-placeholder from 2.26.1 to 2.27.1.

See this package in npm:
@tiptap/extension-placeholder

See this project in Snyk:
https://app.snyk.io/org/continue-dev-inc.-default/project/c5fb30df-a06c-44cb-83af-5ada5ff6e4a9?utm_source=github&utm_medium=referral&page=upgrade-pr

gui/package.json

@@ -31,7 +31,7 @@
     "@tiptap/extension-image": "^2.27.1",
     "@tiptap/extension-mention": "^2.27.1",
     "@tiptap/extension-paragraph": "^2.3.2",
-    "@tiptap/extension-placeholder": "^2.1.13",
+    "@tiptap/extension-placeholder": "^2.27.1",
     "@tiptap/extension-text": "^2.3.2",
     "@tiptap/pm": "^2.1.13",
     "@tiptap/react": "^2.1.13",