chore(deps): bump @tiptap/extension-placeholder from 2.26.1 to 3.1.0

Bumps [@tiptap/extension-placeholder](https://github.com/ueberdosis/tiptap/tree/HEAD/packages-deprecated/extension-placeholder) from 2.26.1 to 3.1.0.
- [Release notes](https://github.com/ueberdosis/tiptap/releases)
- [Changelog](https://github.com/ueberdosis/tiptap/blob/develop/packages-deprecated/extension-placeholder/CHANGELOG.md)
- [Commits](https://github.com/ueberdosis/tiptap/commits/v3.1.0/packages-deprecated/extension-placeholder)

---
updated-dependencies:
- dependency-name: "@tiptap/extension-placeholder"
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -68,7 +68,7 @@
     "@tiptap/extension-horizontal-rule": "^2.26.1",
     "@tiptap/extension-image": "^2.26.1",
     "@tiptap/extension-link": "^2.26.1",
-    "@tiptap/extension-placeholder": "^2.26.1",
+    "@tiptap/extension-placeholder": "^3.1.0",
     "@tiptap/extension-text-style": "^2.26.1",
     "@tiptap/extension-typography": "^2.26.1",
     "@tiptap/extension-underline": "^2.26.1",