Fixed some return type deprecation messages

src/Form/Filters/Constraints/InstanceOfConstraintType.php

@@ -41,7 +41,7 @@ class InstanceOfConstraintType extends AbstractType
         $resolver->setDefault('data_class', InstanceOfConstraint::class);
     }
 
-    public function getParent()
+    public function getParent(): string
     {
         return ChoiceConstraintType::class;
     }

src/Form/ProjectSystem/ProjectBOMEntryCollectionType.php

@@ -8,7 +8,7 @@ use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class ProjectBOMEntryCollectionType extends AbstractType
 {
-    public function getParent()
+    public function getParent(): string
     {
         return CollectionType::class;
     }
@@ -28,7 +28,7 @@ class ProjectBOMEntryCollectionType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'project_bom_entry_collection';
     }

src/Form/ProjectSystem/ProjectBOMEntryType.php

@@ -93,7 +93,7 @@ class ProjectBOMEntryType extends AbstractType
     }
 
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'project_bom_entry';
     }

src/Form/Type/PartLotSelectType.php

@@ -31,7 +31,7 @@ use Symfony\Component\OptionsResolver\OptionsResolver;
 
 class PartLotSelectType extends AbstractType
 {
-    public function getParent()
+    public function getParent(): string
     {
         return EntityType::class;
     }

src/Form/Type/PartSelectType.php

@@ -117,7 +117,7 @@ class PartSelectType extends AbstractType implements DataMapperInterface
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'part_select';
     }

src/Form/Type/ThemeChoiceType.php

@@ -34,7 +34,7 @@ class ThemeChoiceType extends AbstractType
         $this->available_themes = $available_themes;
     }
 
-    public function getParent()
+    public function getParent(): string
     {
         return ChoiceType::class;
     }

src/Form/Type/UserSelectType.php

@@ -40,7 +40,7 @@ class UserSelectType extends AbstractType
         ]);
     }
 
-    public function getParent()
+    public function getParent(): string
     {
         return StructuralEntityType::class;
     }