Bump typedoc from 0.19.2 to 0.20.13 (#6508)

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) from 0.19.2 to 0.20.13.
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Commits](https://github.com/TypeStrong/TypeDoc/compare/v0.19.2...v0.20.13)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -172,7 +172,7 @@
     "ts-node": "^9.0.0",
     "tsconfig-paths": "^3.9.0",
     "tslint": "6.1.3",
-    "typedoc": "^0.19.2",
+    "typedoc": "^0.20.13",
     "typescript": "3.9.7",
     "unist-util-select": "^3.0.2",
     "webpack-cli": "^3.3.12"