Update to PHPUnit 8.5 (#15581)

* use latest phpunit/phpunit ~8.5

* submodule updates

* fixes

2 files changed, 3 insertions, 3 deletions

diff --git a/plugins/Actions/tests/Integration/ActionSiteSearchTest.php b/plugins/Actions/tests/Integration/ActionSiteSearchTest.php
index 27011a30cd..0c22da0643 100644
--- a/plugins/Actions/tests/Integration/ActionSiteSearchTest.php
+++ b/plugins/Actions/tests/Integration/ActionSiteSearchTest.php
@@ -20,7 +20,7 @@ use Piwik\Tracker\Request;
  */
 class ActionSiteSearchTest extends IntegrationTestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/plugins/Actions/tests/Unit/ArchiverTest.php b/plugins/Actions/tests/Unit/ArchiverTest.php
index 9c7cae8f7e..79d61a016c 100644
--- a/plugins/Actions/tests/Unit/ArchiverTest.php
+++ b/plugins/Actions/tests/Unit/ArchiverTest.php
@@ -21,12 +21,12 @@ require_once PIWIK_INCLUDE_PATH . '/plugins/Actions/Actions.php';
  */
 class ArchiverTests extends \PHPUnit\Framework\TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         Fixture::loadAllTranslations();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         Fixture::resetTranslations();
     }