chore: bump @tiptap/extension-underline from 3.7.2 to 3.8.0

Bumps [@tiptap/extension-underline](https://github.com/ueberdosis/tiptap/tree/HEAD/packages/extension-underline) from 3.7.2 to 3.8.0.
- [Release notes](https://github.com/ueberdosis/tiptap/releases)
- [Changelog](https://github.com/ueberdosis/tiptap/blob/v3.8.0/packages/extension-underline/CHANGELOG.md)
- [Commits](https://github.com/ueberdosis/tiptap/commits/v3.8.0/packages/extension-underline)

---
updated-dependencies:
- dependency-name: "@tiptap/extension-underline"
  dependency-version: 3.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/core/package.json

@@ -92,7 +92,7 @@
     "@tiptap/extension-paragraph": "^3.7.2",
     "@tiptap/extension-strike": "^3.7.2",
     "@tiptap/extension-text": "^3.7.2",
-    "@tiptap/extension-underline": "^3.7.2",
+    "@tiptap/extension-underline": "^3.8.0",
     "@tiptap/pm": "^3.7.2",
     "emoji-mart": "^5.6.0",
     "fast-deep-equal": "^3.1.3",