chore(deps): bump @slack/web-api from 5.14.0 to 5.15.0 (#1606)

Bumps [@slack/web-api](https://github.com/slackapi/node-slack-sdk) from 5.14.0 to 5.15.0.
- [Release notes](https://github.com/slackapi/node-slack-sdk/releases)
- [Commits](https://github.com/slackapi/node-slack-sdk/compare/@slack/web-api@5.14.0...@slack/web-api@5.15.0)

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

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

package.json

@@ -27,7 +27,7 @@
   "dependencies": {
     "@doridian/puppeteer-page-proxy": "^1.2.11",
     "@jef/pushbullet": "^2.4.3",
-    "@slack/web-api": "^5.14.0",
+    "@slack/web-api": "^5.15.0",
     "@types/random-useragent": "^0.3.0",
     "@types/redis": "^2.8.28",
     "chalk": "^4.1.0",