Ignore phpstan issue

Author: SmetDenis

src/Collection.php

@@ -68,6 +68,7 @@ public function __construct(JSON $composerFile, JSON $lockFile, ?string $vendorD
      */
     public function buildCollection(): void
     {
+        // @phpstan-ignore-next-line
         $istTest = \defined('\IS_PHPUNIT_TEST') && \IS_PHPUNIT_TEST;
 
         $this->add('php', [

src/ComposerGraph.php

@@ -121,6 +121,7 @@ public function __construct(Collection $collection, array $params = [])
      */
     public function build(): string
     {
+        // @phpstan-ignore-next-line
         $isSafeMode = \defined('\IS_PHPUNIT_TEST') && !\IS_PHPUNIT_TEST;
         Node::safeMode($isSafeMode);