ci: disable deprecations for monorepo builder (#955)

Author: brendt

composer.json

@@ -165,7 +165,7 @@
         "csfixer": "PHP_CS_FIXER_IGNORE_ENV=1 vendor/bin/php-cs-fixer fix --allow-risky=yes",
         "phpstan": "vendor/bin/phpstan analyse src tests --memory-limit=1G",
         "rector": "vendor/bin/rector process --no-ansi",
-        "merge": "vendor/bin/monorepo-builder merge",
+        "merge": "php -d\"error_reporting = E_ALL & ~E_DEPRECATED\" vendor/bin/monorepo-builder merge",
         "release": [
             "composer qa",
             "./bin/release"