chore(deps-dev): bump @types/react-router from 5.1.14 to 5.1.15

Bumps [@types/react-router](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-router) from 5.1.14 to 5.1.15.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react-router)

---
updated-dependencies:
- dependency-name: "@types/react-router"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

packages/fxa-payments-server/package.json

@@ -64,7 +64,7 @@
     "@types/react-document-title": "^2.0.3",
     "@types/react-dom": "^16.9.4",
     "@types/react-redux": "^7.1.16",
-    "@types/react-router": "^5.1.14",
+    "@types/react-router": "^5.1.15",
     "@types/react-router-dom": "^5.1.7",
     "@types/react-stripe-elements": "^1.3.5",
     "@types/react-transition-group": "^4.4.1",