fix: ui/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-DOMPURIFY-8184974
- https://snyk.io/vuln/SNYK-JS-DOMPURIFY-7984421
- https://snyk.io/vuln/SNYK-JS-DOMPURIFY-6474511
- https://snyk.io/vuln/SNYK-JS-DOMPURIFY-8722251

Author: snyk-bot

ui/package.json

@@ -61,7 +61,7 @@
     "react-router": "^4.3.1",
     "react-router-dom": "^4.2.2",
     "react-svg-piechart": "^2.1.1",
-    "redoc": "^2.0.0-rc.40",
+    "redoc": "^2.5.0",
     "sass-loader": "^6.0.6",
     "source-map-loader": "^0.2.3",
     "style-loader": "^0.20.1",