Bump cloudevents/sdk-php from 1.1.0 to 1.2.0 in /laravel

Bumps [cloudevents/sdk-php](https://github.com/cloudevents/sdk-php) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/cloudevents/sdk-php/releases)
- [Commits](cloudevents/sdk-php@v1.1.0...v1.2.0)

---
updated-dependencies:
- dependency-name: cloudevents/sdk-php
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]