chore(deps): bump @koa/router from 14.0.0 to 15.1.1 in /examples/openid-connect (#2465)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: William Bergamin <wbergamin@salesforce.com>

Author: dependabot[bot]

examples/openid-connect/package.json

@@ -10,7 +10,7 @@
   "license": "MIT",
   "repository": "slackapi/node-slack-sdk",
   "dependencies": {
-    "@koa/router": "^14.0.0",
+    "@koa/router": "^15.1.1",
     "@slack/web-api": "^7.3.4",
     "jsonwebtoken": "^9.0.2",
     "koa": "^3.0.0",