Bump http-proxy-middleware from 2.0.7 to 2.0.9 in /web-app (#3529)

Bumps [http-proxy-middleware](https://github.com/chimurai/http-proxy-middleware) from 2.0.7 to 2.0.9.
- [Release notes](https://github.com/chimurai/http-proxy-middleware/releases)
- [Changelog](https://github.com/chimurai/http-proxy-middleware/blob/v2.0.9/CHANGELOG.md)
- [Commits](chimurai/http-proxy-middleware@v2.0.7...v2.0.9)

---
updated-dependencies:
- dependency-name: http-proxy-middleware
  dependency-version: 2.0.9
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

web-app/yarn.lock

@@ -9242,8 +9242,8 @@ __metadata:
   linkType: hard
 
 "http-proxy-middleware@npm:^2.0.3":
-  version: 2.0.7
-  resolution: "http-proxy-middleware@npm:2.0.7"
+  version: 2.0.9
+  resolution: "http-proxy-middleware@npm:2.0.9"
   dependencies:
     "@types/http-proxy": "npm:^1.17.8"
     http-proxy: "npm:^1.18.1"
@@ -9255,7 +9255,7 @@ __metadata:
   peerDependenciesMeta:
     "@types/express":
       optional: true
-  checksum: 10c0/8d00a61eb215b83826460b07489d8bb095368ec16e02a9d63e228dcf7524e7c20d61561e5476de1391aecd4ec32ea093279cdc972115b311f8e0a95a24c9e47e
+  checksum: 10c0/8e9032af625f7c9f2f0d318f6cdb14eb725cc16ffe7b4ccccea25cf591fa819bb7c3bb579e0b543e0ae9c73059b505a6d728290c757bff27bae526a6ed11c05e
   languageName: node
   linkType: hard