Release 0.4.0

What's Changed:

• fix(postgresql): remove hardcoded version from composer.json by @intuibase in 646
• Revert "chore(deps): update dependency psalm/plugin-phpunit to ^0.20.0 (#532)" by @ChrisLightfootWild in 600
• chore(deps): update dependency vimeo/psalm to v6.16.1 by @renovate[bot] in 543
• chore(deps): update dependency psalm/plugin-phpunit to ^0.20.0 by @renovate[bot] in 532

Full Changelog: 0.3.0...0.4.0