Bump @brightspace-ui/core from 2.190.0 to 3.21.4

Bumps [@brightspace-ui/core](https://github.com/BrightspaceUI/core) from 2.190.0 to 3.21.4.
- [Release notes](https://github.com/BrightspaceUI/core/releases)
- [Commits](BrightspaceUI/core@v2.190.0...v3.21.4)

---
updated-dependencies:
- dependency-name: "@brightspace-ui/core"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -32,7 +32,7 @@
   "devDependencies": {
     "@babel/core": "^7",
     "@babel/eslint-parser": "^7",
-    "@brightspace-ui/core": "^2",
+    "@brightspace-ui/core": "^3",
     "@brightspace-ui/stylelint-config": "^0.8",
     "@open-wc/testing": "^4",
     "@web/dev-server": "^0.4",