Update methods to align with os2web_datalookup

Author: jekuaitk

modules/os2forms_dawa/src/Plugin/os2web/DataLookup/DatafordelerDataLookup.php

@@ -102,7 +102,7 @@ public function getMatrikulaEntries(string $matrikulaId) : array {
   /**
    * {@inheritdoc}
    */
-  public function defaultConfiguration() {
+  public function defaultConfiguration(): array {
     return [
       'username' => '',
       'password' => '',

modules/os2forms_dawa/src/Plugin/os2web/DataLookup/DawaDataLookup.php

@@ -46,7 +46,7 @@ public function getMatrikulaAutocompletePath() {
   /**
    * {@inheritdoc}
    */
-  public function defaultConfiguration() {
+  public function defaultConfiguration(): array {
     return [
       'address_autocomplete_path' => 'https://dawa.aws.dk/adresser/autocomplete',
       'address_api_path' => 'https://dawa.aws.dk/adresser',