chore(deps): update @slack/bolt requirement in /examples/oauth

Updates the requirements on [@slack/bolt](https://github.com/slackapi/bolt-js) to permit the latest version.
- [Release notes](https://github.com/slackapi/bolt-js/releases)
- [Commits](https://github.com/slackapi/bolt-js/compare/@slack/[email protected]...@slack/[email protected])

---
updated-dependencies:
- dependency-name: "@slack/bolt"
  dependency-version: 4.6.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/oauth/package.json

@@ -10,6 +10,6 @@
   "author": "Slack Technologies, Inc.",
   "license": "MIT",
   "dependencies": {
-    "@slack/bolt": "^4.5.0"
+    "@slack/bolt": "^4.6.0"
   }
 }