Issue #3465353 by mstrelan: ComponentGenerator hardcodes PHP 7.3.0

(cherry picked from commit 5702b189)

composer/Generator/ComponentGenerator.php

@@ -226,7 +226,7 @@ protected function initialPackageMetadata(): array {
       ],
       // Always reconcile PHP version.
       'require' => [
-        'php' => '>=7.3.0',
+        'php' => '>=' . \Drupal::MINIMUM_PHP,
       ],
     ];
   }