Update reserved names in GeneratorCommand (#41441)

Since PHP 8.0 there are new keywords, which should be reserved in GeneratorCommand class.

Author: zeusaadam

src/Illuminate/Console/GeneratorCommand.php

@@ -56,6 +56,7 @@ abstract class GeneratorCommand extends Command
         'endif',
         'endswitch',
         'endwhile',
+        'enum',
         'eval',
         'exit',
         'extends',
@@ -76,13 +77,15 @@ abstract class GeneratorCommand extends Command
         'interface',
         'isset',
         'list',
+        'match',
         'namespace',
         'new',
         'or',
         'print',
         'private',
         'protected',
         'public',
+        'readonly',
         'require',
         'require_once',
         'return',