Fix some self deprecation notices

src/Form/Type/Api/ClientType.php

@@ -45,7 +45,7 @@ class ClientType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'client';
     }

src/Form/Type/ChangePasswordType.php

@@ -41,7 +41,7 @@ class ChangePasswordType extends AbstractType
         ;
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'change_passwd';
     }

src/Form/Type/ConfigType.php

@@ -104,7 +104,7 @@ class ConfigType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'config';
     }

src/Form/Type/EditEntryType.php

@@ -44,7 +44,7 @@ class EditEntryType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'entry';
     }

src/Form/Type/EntryFilterType.php

@@ -197,7 +197,7 @@ class EntryFilterType extends AbstractType
         ;
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'entry_filter';
     }

src/Form/Type/FeedType.php

@@ -30,7 +30,7 @@ class FeedType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'feed_config';
     }

src/Form/Type/IgnoreOriginInstanceRuleType.php

@@ -31,7 +31,7 @@ class IgnoreOriginInstanceRuleType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'ignore_origin_instance_rule';
     }

src/Form/Type/IgnoreOriginUserRuleType.php

@@ -31,7 +31,7 @@ class IgnoreOriginUserRuleType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'ignore_origin_user_rule';
     }

src/Form/Type/NewEntryType.php

@@ -28,7 +28,7 @@ class NewEntryType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'entry';
     }

src/Form/Type/NewTagType.php

@@ -37,7 +37,7 @@ class NewTagType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'tag';
     }

src/Form/Type/NewUserType.php

@@ -53,7 +53,7 @@ class NewUserType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'new_user';
     }

src/Form/Type/RenameTagType.php

@@ -29,7 +29,7 @@ class RenameTagType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'tag';
     }

src/Form/Type/SiteCredentialType.php

@@ -38,7 +38,7 @@ class SiteCredentialType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'site_credential';
     }

src/Form/Type/TaggingRuleImportType.php

@@ -22,7 +22,7 @@ class TaggingRuleImportType extends AbstractType
         ;
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'upload_tagging_rule_file';
     }

src/Form/Type/TaggingRuleType.php

@@ -40,7 +40,7 @@ class TaggingRuleType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'tagging_rule';
     }

src/Form/Type/UploadImportType.php

@@ -27,7 +27,7 @@ class UploadImportType extends AbstractType
         ;
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'upload_import_file';
     }

src/Form/Type/UserInformationType.php

@@ -30,7 +30,7 @@ class UserInformationType extends AbstractType
         ;
     }
 
-    public function getParent()
+    public function getParent(): ?string
     {
         return RegistrationFormType::class;
     }
@@ -42,7 +42,7 @@ class UserInformationType extends AbstractType
         ]);
     }
 
-    public function getBlockPrefix()
+    public function getBlockPrefix(): string
     {
         return 'update_user';
     }