chore: bump serverless in the development-dependencies group

Bumps the development-dependencies group with 1 update: [serverless](https://github.com/serverless/serverless).


Updates `serverless` from 3.39.0 to 3.40.0
- [Release notes](https://github.com/serverless/serverless/releases)
- [Changelog](https://github.com/serverless/serverless/blob/v3.40.0/CHANGELOG.md)
- [Commits](serverless/serverless@v3.39.0...v3.40.0)

---
updated-dependencies:
- dependency-name: serverless
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
...

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

package.json

@@ -26,7 +26,7 @@
     "@dotcom-reliability-kit/logger": "^3.0.2"
   },
   "devDependencies": {
-    "serverless": "^3.39.0"
+    "serverless": "^3.40.0"
   },
   "volta": {
     "node": "20.10.0",