Bump http-proxy-middleware from 2.0.6 to 2.0.7 in /demo

Bumps [http-proxy-middleware](https://github.com/chimurai/http-proxy-middleware) from 2.0.6 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@v2.0.6...v2.0.7)

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

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

Author: dependabot[bot]

demo/yarn.lock

@@ -1418,9 +1418,9 @@ http-parser-js@>=0.5.1:
   integrity sha512-SGeBX54F94Wgu5RH3X5jsDtf4eHyRogWX1XGT3b4HuW3tQPM4AaBzoUji/4AAJNXCEOWZ5O0DgZmJw1947gD5Q==
 
 http-proxy-middleware@^2.0.3:
-  version "2.0.6"
-  resolved "https://registry.yarnpkg.com/http-proxy-middleware/-/http-proxy-middleware-2.0.6.tgz#e1a4dd6979572c7ab5a4e4b55095d1f32a74963f"
-  integrity sha512-ya/UeJ6HVBYxrgYotAZo1KvPWlgB48kUJLDePFeneHsVujFaW5WNj2NgWCAE//B1Dl02BIfYlpNgBy8Kf8Rjmw==
+  version "2.0.7"
+  resolved "https://registry.yarnpkg.com/http-proxy-middleware/-/http-proxy-middleware-2.0.7.tgz#915f236d92ae98ef48278a95dedf17e991936ec6"
+  integrity sha512-fgVY8AV7qU7z/MmXJ/rxwbrtQH4jBQ9m7kp3llF0liB7glmFeVZFBepQb32T3y8n8k2+AEYuMPCpinYW+/CuRA==
   dependencies:
     "@types/http-proxy" "^1.17.8"
     http-proxy "^1.18.1"