chore(deps): bump tslint from 5.20.1 to 6.1.3 in /ui

Bumps [tslint](https://github.com/palantir/tslint) from 5.20.1 to 6.1.3.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.20.1...6.1.3)

---
updated-dependencies:
- dependency-name: tslint
  dependency-version: 6.1.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

ui/package-lock.json

@@ -57,7 +57,7 @@
     "ts-node": "^8.10.2",
     "tsconfig-paths-webpack-plugin": "3.2.0",
     "tslib": "^1.14.1",
-    "tslint": "^5.20.1",
+    "tslint": "^6.1.3",
     "tslint-config-prettier": "^1.18.0",
     "tslint-react": "^3.6.0",
     "uglifyjs-webpack-plugin": "2.2.0",