chore(deps): bump js-yaml and serverless in /examples/python

Removes [js-yaml](https://github.com/nodeca/js-yaml). It's no longer used after updating ancestor dependency [serverless](https://github.com/serverless/serverless). These dependencies need to be updated together.


Removes `js-yaml`

Updates `serverless` from 3.12.0 to 4.23.0
- [Release notes](https://github.com/serverless/serverless/releases)
- [Changelog](https://github.com/serverless/serverless/blob/main/CHANGELOG.md)
- [Commits](serverless/serverless@v3.12.0...v4.23.0)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 
  dependency-type: indirect
- dependency-name: serverless
  dependency-version: 4.23.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]