Bump @tiptap/extension-placeholder in /src/dispatch/static/dispatch (Netflix#4329)

Bumps [@tiptap/extension-placeholder](https://github.com/ueberdosis/tiptap/tree/HEAD/packages/extension-placeholder) from 2.1.16 to 2.2.1.
- [Release notes](https://github.com/ueberdosis/tiptap/releases)
- [Changelog](https://github.com/ueberdosis/tiptap/blob/main/packages/extension-placeholder/CHANGELOG.md)
- [Commits](https://github.com/ueberdosis/tiptap/commits/v2.2.1/packages/extension-placeholder)

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

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Author: dependabot[bot]