Bump vimeo/psalm from 3.9.3 to 3.9.4

Bumps [vimeo/psalm](https://github.com/vimeo/psalm) from 3.9.3 to 3.9.4.
- [Release notes](https://github.com/vimeo/psalm/releases)
- [Commits](https://github.com/vimeo/psalm/compare/3.9.3...3.9.4

)

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