Update dependency typescript to v3.9.3 (#9)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

extensions/jupyterlab/package.json

@@ -38,7 +38,7 @@
   "devDependencies": {
     "prettier": "2.0.5",
     "rimraf": "3.0.2",
-    "typescript": "3.9.2"
+    "typescript": "3.9.3"
   },
   "jupyterlab": {
     "extension": true

extensions/jupyterlab/yarn.lock

@@ -1263,10 +1263,10 @@ typed-styles@^0.0.7:
   resolved "https://registry.yarnpkg.com/typed-styles/-/typed-styles-0.0.7.tgz#93392a008794c4595119ff62dde6809dbc40a3d9"
   integrity sha512-pzP0PWoZUhsECYjABgCGQlRGL1n7tOHsgwYv3oIiEpJwGhFTuty/YNeduxQYzXXa3Ge5BdT6sHYIQYpl4uJ+5Q==
 
-typescript@3.9.2:
-  version "3.9.2"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.2.tgz#64e9c8e9be6ea583c54607677dd4680a1cf35db9"
-  integrity sha512-q2ktq4n/uLuNNShyayit+DTobV2ApPEo/6so68JaD5ojvc/6GClBipedB9zNWYxRSAlZXAe405Rlijzl6qDiSw==
+typescript@3.9.3:
+  version "3.9.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.3.tgz#d3ac8883a97c26139e42df5e93eeece33d610b8a"
+  integrity sha512-D/wqnB2xzNFIcoBG9FG8cXRDjiqSTbG2wd8DMZeQyJlP1vfTkIxH4GKveWaEBYySKIg+USu+E+EDIR47SqnaMQ==
 
 typestyle@^2.0.4:
   version "2.1.0"