chore(deps-dev): bump chai

Bumps the dev-chai group in /packages/socket-mode with 1 update: [chai](https://github.com/chaijs/chai).


Updates `chai` from 4.5.0 to 6.0.1
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/main/History.md)
- [Commits](chaijs/chai@v4.5.0...v6.0.1)

---
updated-dependencies:
- dependency-name: chai
  dependency-version: 6.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: dev-chai
...

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

Author: dependabot[bot]

packages/socket-mode/package.json

@@ -64,7 +64,7 @@
     "@types/proxyquire": "^1.3.31",
     "@types/sinon": "^17",
     "c8": "^10.1.2",
-    "chai": "^4",
+    "chai": "^6",
     "mocha": "^11",
     "mocha-junit-reporter": "^2.2.1",
     "mocha-multi-reporters": "^1.5.1",