build(deps): bump rate-limiter-flexible from 2.1.14 to 2.1.15 (#12896)

Bumps [rate-limiter-flexible](https://github.com/animir/node-rate-limiter-flexible) from 2.1.14 to 2.1.15.
- [Release notes](https://github.com/animir/node-rate-limiter-flexible/releases)
- [Commits](https://github.com/animir/node-rate-limiter-flexible/commits)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -60,7 +60,7 @@
     "paypal-rest-sdk": "^1.8.1",
     "pp-ipn": "^1.1.0",
     "ps-tree": "^1.0.0",
-    "rate-limiter-flexible": "^2.1.14",
+    "rate-limiter-flexible": "^2.1.15",
     "redis": "^3.0.2",
     "regenerator-runtime": "^0.13.7",
     "remove-markdown": "^0.3.0",