Prevent Symfony 6 deprecation notices (#327)

Co-authored-by: Florent Morselli <[email protected]>

Author: a-menshchikov

src/Bundle/JoseFramework/DataCollector/JoseCollector.php

@@ -29,7 +29,7 @@ public function add(Collector $collector): void
         $this->collectors[] = $collector;
     }
 
-    public function getName()
+    public function getName(): string
     {
         return 'jose_collector';
     }

src/Component/Console/GeneratorCommand.php

@@ -13,7 +13,7 @@
 
 abstract class GeneratorCommand extends ObjectOutputCommand
 {
-    public function isEnabled()
+    public function isEnabled(): bool
     {
         return class_exists(JWKFactory::class);
     }