Make psalm happy by casting to string

This is always a string, but because the parent class says it's
`null|string`, we cannot just override the type here (this gives another
error: NonInvariantDocblockPropertyType).

Casting to a string is safe though since we know it's always a string
anyway.

src/Commands/CheckLicenses.php

@@ -19,7 +19,6 @@
 
 class CheckLicenses extends Command
 {
-    /** @var string */
     protected static $defaultName = 'check';
 
     public function __construct(
@@ -28,7 +27,7 @@ public function __construct(
         private readonly DependencyTree $dependencyTree,
         private readonly TableRenderer $tableRenderer
     ) {
-        parent::__construct(self::$defaultName);
+        parent::__construct((string) self::$defaultName);
     }
 
     protected function configure(): void

src/Commands/CountUsedLicenses.php

@@ -14,13 +14,12 @@
 
 class CountUsedLicenses extends Command
 {
-    /** @var string */
     protected static $defaultName = 'count';
 
     public function __construct(
         private readonly UsedLicensesParser $usedLicensesParser
     ) {
-        parent::__construct(self::$defaultName);
+        parent::__construct((string) self::$defaultName);
     }
 
     protected function configure(): void

src/Commands/GenerateConfig.php

@@ -16,14 +16,13 @@
 
 class GenerateConfig extends Command
 {
-    /** @var string */
     protected static $defaultName = 'generate-config';
 
     public function __construct(
         private readonly AllowedLicensesParser $allowedLicensesParser,
         private readonly UsedLicensesParser $usedLicensesParser
     ) {
-        parent::__construct(self::$defaultName);
+        parent::__construct((string) self::$defaultName);
     }
 
     protected function configure(): void

src/Commands/ListAllowedLicenses.php

@@ -13,13 +13,12 @@
 
 class ListAllowedLicenses extends Command
 {
-    /** @var string */
     protected static $defaultName = 'allowed';
 
     public function __construct(
         private readonly AllowedLicensesParser $allowedLicensesParser
     ) {
-        parent::__construct(self::$defaultName);
+        parent::__construct((string) self::$defaultName);
     }
 
     protected function configure(): void

src/Commands/ListUsedLicenses.php

@@ -14,13 +14,12 @@
 
 class ListUsedLicenses extends Command
 {
-    /** @var string */
     protected static $defaultName = 'used';
 
     public function __construct(
         private readonly UsedLicensesParser $usedLicensesParser
     ) {
-        parent::__construct(self::$defaultName);
+        parent::__construct((string) self::$defaultName);
     }
 
     protected function configure(): void