build(deps): bump flat from 4.1.0 to 5.0.1 in /packages/wxa-redux

Bumps [flat](https://github.com/hughsk/flat) from 4.1.0 to 5.0.1.
- [Release notes](https://github.com/hughsk/flat/releases)
- [Commits](hughsk/flat@4.1.0...5.0.1)

---
updated-dependencies:
- dependency-name: flat
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/wxa-redux/package-lock.json

@@ -27,7 +27,7 @@
     "dependencies": {
         "@wxa/core": "latest",
         "deep-object-diff": "^1.1.0",
-        "flat": "^4.1.0",
+        "flat": "^5.0.1",
         "redux": "^3.7.2",
         "shallowequal": "^1.1.0"
     },