build(deps): update prop-types requirement

Updates the requirements on [prop-types](https://github.com/facebook/prop-types) to permit the latest version.
- [Changelog](https://github.com/facebook/prop-types/blob/main/CHANGELOG.md)
- [Commits](facebook/prop-types@v15.6.2...v15.8.1)

---
updated-dependencies:
- dependency-name: prop-types
  dependency-type: direct:production
...

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

superset-frontend/plugins/legacy-plugin-chart-event-flow/package.json

@@ -30,7 +30,7 @@
   },
   "dependencies": {
     "@data-ui/event-flow": "^0.0.84",
-    "prop-types": "^15.6.2"
+    "prop-types": "^15.8.1"
   },
   "peerDependencies": {
     "react": "^15 || ^16",