Remove invalid checkMissingIterableValueType PHPStan parameter

- This parameter is not recognized by PHPStan
- Causes CI build failures
- Removing it to fix PHPStan configuration error

Author: scott grayson

phpstan.neon.dist

@@ -10,7 +10,6 @@ parameters:
     tmpDir: build/phpstan
     checkOctaneCompatibility: true
     checkModelProperties: true
-    checkMissingIterableValueType: false
     ignoreErrors:
         - '#Class App\\Models\\User not found#'
         - '#Call to static method .* on an unknown class App\\Models\\User#'