Bump php-standard-library/psalm-plugin from 2.3.0 to 2.4.0

Bumps [php-standard-library/psalm-plugin](https://github.com/php-standard-library/psalm-plugin) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/php-standard-library/psalm-plugin/releases)
- [Commits](php-standard-library/psalm-plugin@2.3.0...2.4.0)

---
updated-dependencies:
- dependency-name: php-standard-library/psalm-plugin
  dependency-version: 2.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]