Specify executables in composer integrate (phpactor#2553)

Similar to 346e727. Makes the
commands run on Windows (where only files with specific extensions,
like .exe, can be executable).

composer.json

@@ -114,11 +114,11 @@
             "@php bin/phpactor config:json-schema phpactor.schema.json"
         ],
         "integrate": [
-            "composer validate --strict",
-            "vendor/bin/php-cs-fixer fix",
-            "vendor/bin/phpstan analyse --memory-limit=-1",
-            "vendor/bin/phpunit",
-            "vendor/bin/phpbench run --iterations=1 --revs=1",
+            "@composer validate --strict",
+            "@php vendor/bin/php-cs-fixer fix",
+            "@php vendor/bin/phpstan analyse --memory-limit=-1",
+            "@php vendor/bin/phpunit",
+            "@php vendor/bin/phpbench run --iterations=1 --revs=1",
             "make docs"
         ]
     }