Bump http-proxy-middleware from 0.17.4 to 2.0.7 in /packages/polyserve

Bumps [http-proxy-middleware](https://github.com/chimurai/http-proxy-middleware) from 0.17.4 to 2.0.7.
- [Release notes](https://github.com/chimurai/http-proxy-middleware/releases)
- [Changelog](https://github.com/chimurai/http-proxy-middleware/blob/v2.0.7/CHANGELOG.md)
- [Commits](chimurai/http-proxy-middleware@v0.17.4...v2.0.7)

---
updated-dependencies:
- dependency-name: http-proxy-middleware
  dependency-type: direct:production
...

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

packages/polyserve/package.json

@@ -49,7 +49,7 @@
     "escape-html": "^1.0.3",
     "express": "^4.8.5",
     "find-port": "^1.0.1",
-    "http-proxy-middleware": "^0.17.2",
+    "http-proxy-middleware": "^2.0.7",
     "lru-cache": "^4.0.2",
     "mime": "^2.3.1",
     "mz": "^2.4.0",