Bump typedoc from 0.20.36 to 0.21.1

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) from 0.20.36 to 0.21.1.
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Commits](https://github.com/TypeStrong/TypeDoc/compare/v0.20.36...v0.21.1)

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

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

package.json

@@ -90,7 +90,7 @@
     "tsconfig-paths": "^3.9.0",
     "tslint": "^6.1.3",
     "tslint-immutable": "^6.0.1",
-    "typedoc": "^0.20.29",
+    "typedoc": "^0.21.1",
     "typescript": "4.2.4",
     "webpack": "^5.28.0",
     "webpack-cli": "^4.6.0"