Override base type to not include null

Because the defaultName is documented in the base class as string|null,
psalm is not happy, because we're calling the parent constructor with a
potential null value. Since we're always setting this to a string, we
can safely avoid this though.

src/Commands/CheckLicenses.php

@@ -19,6 +19,7 @@
 
 class CheckLicenses extends Command
 {
+    /** @var string */
     protected static $defaultName = 'check';
 
     public function __construct(

src/Commands/CountUsedLicenses.php

@@ -14,6 +14,7 @@
 
 class CountUsedLicenses extends Command
 {
+    /** @var string */
     protected static $defaultName = 'count';
 
     public function __construct(

src/Commands/GenerateConfig.php

@@ -16,6 +16,7 @@
 
 class GenerateConfig extends Command
 {
+    /** @var string */
     protected static $defaultName = 'generate-config';
 
     public function __construct(

src/Commands/ListAllowedLicenses.php

@@ -13,6 +13,7 @@
 
 class ListAllowedLicenses extends Command
 {
+    /** @var string */
     protected static $defaultName = 'allowed';
 
     public function __construct(

src/Commands/ListUsedLicenses.php

@@ -14,6 +14,7 @@
 
 class ListUsedLicenses extends Command
 {
+    /** @var string */
     protected static $defaultName = 'used';
 
     public function __construct(