Bump webex from 1.133.1 to 1.139.0 in /services/bot (#171)

Bumps [webex](https://github.com/webex/webex-js-sdk) from 1.133.1 to 1.139.0.
- [Release notes](https://github.com/webex/webex-js-sdk/releases)
- [Changelog](https://github.com/webex/webex-js-sdk/blob/master/CHANGELOG.md)
- [Commits](webex/webex-js-sdk@v1.133.1...v1.139.0)

---
updated-dependencies:
- dependency-name: webex
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

services/bot/package.json

@@ -75,7 +75,7 @@
     "moment": "^2.29.1",
     "mongoose": "^5.13.0",
     "string-similarity": "^4.0.4",
-    "webex": "1.133.1",
+    "webex": "1.139.0",
     "winston": "^3.3.3"
   }
 }