Restore Psalm (#1035)

Author: kubawerlos

.dev-tools/composer.json

@@ -14,7 +14,8 @@
         "phpstan/phpstan-strict-rules": "^2.0.4",
         "shipmonk/composer-dependency-analyser": "^1.8.3",
         "squizlabs/php_codesniffer": "^3.13.0",
-        "tomasvotruba/type-coverage": "^2.0.2"
+        "tomasvotruba/type-coverage": "^2.0.2",
+        "vimeo/psalm": "^6.12"
     },
     "autoload": {
         "psr-4": {
@@ -41,7 +42,8 @@
             "composer-dependency-analyser --composer-json=../composer.json",
             "phpcs",
             "phpmd ../src text phpmd.xml",
-            "phpstan analyse --no-progress"
+            "phpstan analyse --no-progress",
+            "psalm --no-cache --no-progress --shepherd"
         ],
         "fix": [
             "@composer normalize --no-check-lock ../composer.json",