chore(deps): bump joi and botbuilder

Removes [joi](https://github.com/hapijs/joi). It's no longer used after updating ancestor dependency [botbuilder](https://github.com/Microsoft/botbuilder-js). These dependencies need to be updated together.


Removes `joi`

Updates `botbuilder` from 3.15.0 to 3.30.0
- [Release notes](https://github.com/Microsoft/botbuilder-js/releases)
- [Commits](https://github.com/Microsoft/botbuilder-js/commits)

---
updated-dependencies:
- dependency-name: joi
  dependency-version:
  dependency-type: indirect
- dependency-name: botbuilder
  dependency-version: 3.30.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

samples/react-aadtokenprovider-bot/bot/package-lock.json

@@ -4,7 +4,7 @@
   "description": "",
   "main": "app.js",
   "dependencies": {
-    "botbuilder": "3.15.0",
+    "botbuilder": "3.30.0",
     "botbuilder-azure": "^4.23.3",
     "node-fetch": "2.1.2",
     "restify": "7.2.1"