build(deps): bump http-proxy-middleware in /microsite

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](https://github.com/chimurai/http-proxy-middleware/compare/v2.0.7...v2.0.9)

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

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

microsite/yarn.lock

@@ -7749,8 +7749,8 @@ __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"
@@ -7762,7 +7762,7 @@ __metadata:
   peerDependenciesMeta:
     "@types/express":
       optional: true
-  checksum: 10/4a51bf612b752ad945701995c1c029e9501c97e7224c0cf3f8bf6d48d172d6a8f2b57c20fec469534fdcac3aa8a6f332224a33c6b0d7f387aa2cfff9b67216fd
+  checksum: 10/4ece416a91d52e96f8136c5f4abfbf7ac2f39becbad21fa8b158a12d7e7d8f808287ff1ae342b903fd1f15f2249dee87fabc09e1f0e73106b83331c496d67660
   languageName: node
   linkType: hard