Composer Dev(deps-dev): Bump rector/rector from 2.3.8 to 2.4.0

Bumps [rector/rector](https://github.com/rectorphp/rector) from 2.3.8 to 2.4.0.
- [Release notes](https://github.com/rectorphp/rector/releases)
- [Commits](rectorphp/rector@2.3.8...2.4.0)

---
updated-dependencies:
- dependency-name: rector/rector
  dependency-version: 2.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]