Update to PHPUnit 8.5 (#15581)

* use latest phpunit/phpunit ~8.5

* submodule updates

* fixes

3 files changed, 5 insertions, 5 deletions

diff --git a/tests/resources/custompluginsdir/CustomDirPlugin/tests/Fixtures/SimpleFixtureTrackFewVisits.php b/tests/resources/custompluginsdir/CustomDirPlugin/tests/Fixtures/SimpleFixtureTrackFewVisits.php
index f5d58969d0..0e347b16e4 100644
--- a/tests/resources/custompluginsdir/CustomDirPlugin/tests/Fixtures/SimpleFixtureTrackFewVisits.php
+++ b/tests/resources/custompluginsdir/CustomDirPlugin/tests/Fixtures/SimpleFixtureTrackFewVisits.php
@@ -14,12 +14,12 @@ class SimpleFixtureTrackFewVisits extends Fixture
     public $dateTime = '2013-01-23 01:23:45';
     public $idSite = 1;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->setUpWebsite();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         // empty
     }
diff --git a/tests/resources/custompluginsdir/CustomDirPlugin/tests/Integration/SystemSettingsTest.php b/tests/resources/custompluginsdir/CustomDirPlugin/tests/Integration/SystemSettingsTest.php
index 3e9537b85a..a930a56798 100644
--- a/tests/resources/custompluginsdir/CustomDirPlugin/tests/Integration/SystemSettingsTest.php
+++ b/tests/resources/custompluginsdir/CustomDirPlugin/tests/Integration/SystemSettingsTest.php
@@ -23,7 +23,7 @@ class SystemSettingsTest extends IntegrationTestCase
      */
     private $settings;
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/resources/custompluginsdir/CustomDirPlugin/tests/Unit/CustomClassTest.php b/tests/resources/custompluginsdir/CustomDirPlugin/tests/Unit/CustomClassTest.php
index 20251d9326..00c6b06f7f 100644
--- a/tests/resources/custompluginsdir/CustomDirPlugin/tests/Unit/CustomClassTest.php
+++ b/tests/resources/custompluginsdir/CustomDirPlugin/tests/Unit/CustomClassTest.php
@@ -16,12 +16,12 @@ use Piwik\Plugins\CustomDirPlugin\CustomClass;
  */
 class CustomClassTest extends \PHPUnit\Framework\TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         // set up here if needed
     }
     
-    public function tearDown()
+    public function tearDown(): void
     {
         // tear down here if needed
     }