Bump @slack/socket-mode from 1.3.5 to 2.0.0

Bumps [@slack/socket-mode](https://github.com/slackapi/node-slack-sdk) from 1.3.5 to 2.0.0.
- [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: "@slack/socket-mode"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -42,7 +42,7 @@
   "dependencies": {
     "@slack/logger": "^4.0.0",
     "@slack/oauth": "^2.6.2",
-    "@slack/socket-mode": "^1.3.3",
+    "@slack/socket-mode": "^2.0.0",
     "@slack/types": "^2.11.0",
     "@slack/web-api": "^6.11.2",
     "@types/express": "^4.16.1",