Bump serverless from 4.20.2 to 4.21.1 (#161)

Bumps [serverless](https://github.com/serverless/serverless) from 4.20.2 to 4.21.1.
- [Release notes](https://github.com/serverless/serverless/releases)
- [Changelog](https://github.com/serverless/serverless/blob/main/CHANGELOG.md)
- [Commits](serverless/serverless@v4.20.2...v4.21.1)

---
updated-dependencies:
- dependency-name: serverless
  dependency-version: 4.21.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -9,7 +9,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "serverless": "^4.20.2",
+    "serverless": "^4.21.1",
     "serverless-python-requirements": "^6.1.2"
   }
 }