Bump slugify from 1.3.6 to 1.4.0 in /web

Bumps [slugify](https://github.com/simov/slugify) from 1.3.6 to 1.4.0.
- [Release notes](https://github.com/simov/slugify/releases)
- [Commits](https://github.com/simov/slugify/compare/v1.3.6...v1.4.0)

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

web/package.json

@@ -19,7 +19,7 @@
     "react-dom": "^16.13.0",
     "react-router-dom": "^5.1.2",
     "react-scripts": "^3.4.0",
-    "slugify": "^1.3.6",
+    "slugify": "^1.4.0",
     "typescript": "^3.8.3"
   },
   "scripts": {