Bump http-proxy-middleware from 3.0.5 to 4.0.0

Bumps [http-proxy-middleware](https://github.com/chimurai/http-proxy-middleware) from 3.0.5 to 4.0.0.
- [Release notes](https://github.com/chimurai/http-proxy-middleware/releases)
- [Changelog](https://github.com/chimurai/http-proxy-middleware/blob/master/CHANGELOG.md)
- [Commits](chimurai/http-proxy-middleware@v3.0.5...v4.0.0)

---
updated-dependencies:
- dependency-name: http-proxy-middleware
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -219,7 +219,7 @@
     "highlightjs-curl": "^1.3.0",
     "hot-shots": "^14.3.1",
     "html-entities": "^2.5.6",
-    "http-proxy-middleware": "^3.0.5",
+    "http-proxy-middleware": "^4.0.0",
     "imurmurhash": "^0.1.4",
     "is-svg": "6.0.0",
     "javascript-stringify": "^2.1.0",