message: fix(express): re-add `typescript` to express dev deps
  We can't use the root `tsc` when installing during docker builds, so
  re-add the explicit `typescript` dependency to express until we can
  convert the docker image build to use yarn.
diff: "should-sinon": "^0.0.6",
  "sinon": "^6.3.5",
  "supertest": "^4.0.2",
  - "supertest-as-promised": "https://github.com/BitGo/supertest-as-promised/archive/a7f4b612b9fa090ae33a9616c41862aec2b25c7e.tar.gz"
  + "supertest-as-promised": "https://github.com/BitGo/supertest-as-promised/archive/a7f4b612b9fa090ae33a9616c41862aec2b25c7e.tar.gz",
  + "typescript": "~4.2.4"
  },
  "nyc": {
  "extension": [
  