Bump formiojs from 4.21.5 to 4.21.6

Bumps [formiojs](https://github.com/formio/formio.js) from 4.21.5 to 4.21.6.
- [Changelog](https://github.com/formio/formio.js/blob/v4.21.6/Changelog.md)
- [Commits](formio/formio.js@v4.21.5...v4.21.6)

---
updated-dependencies:
- dependency-name: formiojs
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -71,7 +71,7 @@
     "eslint-plugin-prettier": "^5.2.1",
     "eslint-plugin-storybook": "0.11.0",
     "eslint-webpack-plugin": "^4.2.0",
-    "formiojs": "4.21.5",
+    "formiojs": "4.21.6",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
     "lodash": "^4.17.21",