Bump szepeviktor/phpstan-wordpress in /plugins/basicrum

Bumps [szepeviktor/phpstan-wordpress](https://github.com/szepeviktor/phpstan-wordpress) from 2.0.3 to 2.0.4.
- [Release notes](https://github.com/szepeviktor/phpstan-wordpress/releases)
- [Commits](szepeviktor/phpstan-wordpress@v2.0.3...v2.0.4)

---
updated-dependencies:
- dependency-name: szepeviktor/phpstan-wordpress
  dependency-version: 2.0.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]