Update psy/psysh requirement from ^0.11 to ^0.12

Updates the requirements on [psy/psysh](https://github.com/bobthecow/psysh) to permit the latest version.
- [Release notes](https://github.com/bobthecow/psysh/releases)
- [Commits](bobthecow/psysh@v0.11.0...v0.12.0)

---
updated-dependencies:
- dependency-name: psy/psysh
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -26,7 +26,7 @@
     "require-dev": {
         "phlak/coding-standards": "^2.2",
         "phpstan/phpstan": "^1.10",
-        "psy/psysh": "^0.11",
+        "psy/psysh": "^0.12",
         "yoast/phpunit-polyfills": "^2.0"
     },
     "autoload": {