tools(deps-dev): Update vimeo/psalm requirement in /tools/psalm (#301)

Updates the requirements on [vimeo/psalm](https://github.com/vimeo/psalm) to permit the latest version.
- [Release notes](https://github.com/vimeo/psalm/releases)
- [Commits](vimeo/psalm@5.11.0...5.12.0)

---
updated-dependencies:
- dependency-name: vimeo/psalm
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tools/psalm/composer.json

@@ -4,7 +4,7 @@
     "type": "metapackage",
     "require-dev": {
         "roave/security-advisories": "dev-latest",
-        "vimeo/psalm": "5.11.0"
+        "vimeo/psalm": "5.12.0"
     },
     "prefer-stable": true,
     "config": {