Issue #3289674 by Project Update Bot: Automated Drupal 10 compatibility fixes

simplenews_decoupled.info.yml

 name: 'Simplenews Decoupled'
 type: module
 description: 'Provides a post endpoint for adding new subscribers.'
-core_version_requirement: ^8 || ^9
+core_version_requirement: ^8 || ^9 || ^10
 package: 'Mail'
 dependencies:
   - simplenews:simplenews (>=8.x-2.x)

tests/src/Functional/LoadTest.php

@@ -34,7 +34,7 @@ class LoadTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  protected function setUp() {
+  protected function setUp(): void {
     parent::setUp();
     $this->user = $this->drupalCreateUser(['administer site configuration']);
     $this->drupalLogin($this->user);