Resolve #3425412 "Phpstan 2 quick fixes"

Closes #3425412

composer/Metapackage/DevDependencies/composer.json

@@ -12,6 +12,7 @@
         "colinodell/psr-testlogger": "^1.2",
         "composer/composer": "^2.7",
         "drupal/coder": "^8.3.10",
+        "jangregor/phpstan-prophecy": "^1.0.2",
         "justinrainbow/json-schema": "^5.2",
         "lullabot/mink-selenium2-driver": "^1.7",
         "lullabot/php-webdriver": "^2.0.3",