Bump debug from 2.6.9 to 4.3.4

Bumps [debug](https://github.com/debug-js/debug) from 2.6.9 to 4.3.4.
- [Release notes](https://github.com/debug-js/debug/releases)
- [Commits](debug-js/debug@2.6.9...4.3.4)

---
updated-dependencies:
- dependency-name: debug
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "connect": "^3.6.6",
     "connect-history-api-fallback": "^1.2.0",
-    "debug": "^2.2.0",
+    "debug": "^4.3.4",
     "http-proxy-middleware": "^0.19.1",
     "minimist": "^1.2.0",
     "serve-index": "^1.9.1",