Bump trix from 2.1.1 to 2.1.4 in /core/assets

Bumps [trix](https://github.com/basecamp/trix) from 2.1.1 to 2.1.4.
- [Release notes](https://github.com/basecamp/trix/releases)
- [Commits](basecamp/trix@v2.1.1...v2.1.4)

---
updated-dependencies:
- dependency-name: trix
  dependency-type: direct:production
...

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

core/assets/package.json

@@ -11,7 +11,7 @@
     "lodash": "^4.17.21",
     "pdfjs-dist": "^3.11.174",
     "stringify": "^5.2.0",
-    "trix": "^2.1.1"
+    "trix": "^2.1.4"
   },
   "devDependencies": {
     "prettier": "2.7.1",