build(deps-dev): Bump psalm/phar from 5.18.0 to 5.20.0

Bumps [psalm/phar](https://github.com/psalm/phar) from 5.18.0 to 5.20.0.
- [Release notes](https://github.com/psalm/phar/releases)
- [Commits](psalm/phar@5.18.0...5.20.0)

---
updated-dependencies:
- dependency-name: psalm/phar
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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