Bump @slack/web-api from 7.15.0 to 7.15.1 (#270)

Bumps [@slack/web-api](https://github.com/slackapi/node-slack-sdk) from 7.15.0 to 7.15.1.
- [Release notes](https://github.com/slackapi/node-slack-sdk/releases)
- [Commits](https://github.com/slackapi/node-slack-sdk/compare/@slack/web-api@7.15.0...@slack/web-api@7.15.1)

---
updated-dependencies:
- dependency-name: "@slack/web-api"
  dependency-version: 7.15.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

package-lock.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "@probot/adapter-aws-lambda-serverless": "^4.0.3",
-    "@slack/web-api": "^7.15.0",
+    "@slack/web-api": "^7.15.1",
     "probot": "^14.3.2"
   },
   "repository": "github:emergency-pull-request-probot-app",