Bump typedoc from 0.21.2 to 0.21.4

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) from 0.21.2 to 0.21.4.
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Commits](https://github.com/TypeStrong/TypeDoc/compare/v0.21.2...v0.21.4)

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

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

package.json

@@ -63,7 +63,7 @@
     "svg-inline-loader": "^0.8.2",
     "ts-loader": "^9.2.3",
     "tslib": "^2.3.0",
-    "typedoc": "^0.21.2",
+    "typedoc": "^0.21.4",
     "typescript": "^4.3.5",
     "url-loader": "^4.1.1",
     "val-loader": "4.0.0",