Bump vimeo/psalm from 4.6.2 to 4.6.3 (#9)

Bumps [vimeo/psalm](https://github.com/vimeo/psalm) from 4.6.2 to 4.6.3.
- [Release notes](https://github.com/vimeo/psalm/releases)
- [Commits](vimeo/psalm@4.6.2...4.6.3)

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