composer(deps-dev): bump psalm/plugin-phpunit from 0.11.0 to 0.12.1

Bumps [psalm/plugin-phpunit](https://github.com/psalm/psalm-plugin-phpunit) from 0.11.0 to 0.12.1.
- [Release notes](https://github.com/psalm/psalm-plugin-phpunit/releases)
- [Commits](psalm/psalm-plugin-phpunit@0.11.0...0.12.1)

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

composer.json

@@ -30,7 +30,7 @@
     "phpstan/phpstan-phpunit": "~0.12.16",
     "phpstan/phpstan-strict-rules": "~0.12.5",
     "phpunit/phpunit": "^8.5.5",
-    "psalm/plugin-phpunit": "~0.11.0",
+    "psalm/plugin-phpunit": "~0.12.1",
     "vimeo/psalm": "^3.14.2"
   },
   "config": {