Bump axios and @slack/web-api

Bumps [axios](https://github.com/axios/axios) to 1.6.1 and updates ancestor dependency [@slack/web-api](https://github.com/slackapi/node-slack-sdk). These dependencies need to be updated together.


Updates `axios` from 0.27.2 to 1.6.1
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Commits](axios/axios@v0.27.2...v1.6.1)

Updates `@slack/web-api` from 6.7.2 to 6.9.1
- [Release notes](https://github.com/slackapi/node-slack-sdk/releases)
- [Commits](https://github.com/slackapi/node-slack-sdk/compare/@slack/[email protected]...@slack/[email protected])

---
updated-dependencies:
- dependency-name: axios
  dependency-type: indirect
- dependency-name: "@slack/web-api"
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -7,7 +7,7 @@
   "author": "Florent Biville <[email protected]>",
   "license": "Apache-2.0",
   "dependencies": {
-    "@slack/web-api": "^6.7.2",
+    "@slack/web-api": "^6.9.1",
     "express": "^4.17.1"
   }
 }