chore: bump the development-dependencies group across 1 directory with 2 updates

Bumps the development-dependencies group with 2 updates in the / directory: [undici](https://github.com/nodejs/undici) and @financial-times/n-express.


Updates `undici` from 6.19.4 to 6.19.5
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.19.4...v6.19.5)

Updates `@financial-times/n-express` from 31.8.0 to 31.9.0

---
updated-dependencies:
- dependency-name: undici
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
- dependency-name: "@financial-times/n-express"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
...

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

Author: dependabot[bot]

package-lock.json

@@ -24,6 +24,6 @@
     "express": "^4.19.2",
     "node-fetch-1": "npm:node-fetch@^1.7.3",
     "node-fetch-2": "npm:node-fetch@^2.7.0",
-    "undici": "^6.19.4"
+    "undici": "^6.19.5"
   }
 }

packages/fetch-error-handler/package.json

@@ -20,7 +20,7 @@
     "@dotcom-reliability-kit/log-error": "^4.2.0"
   },
   "devDependencies": {
-    "@financial-times/n-express": "^31.8.0",
+    "@financial-times/n-express": "^31.9.0",
     "@types/express": "^4.17.21"
   }
 }