minor #28348 Fix usage of setUp in tests (3.4) (fabpot)

This PR was merged into the 3.4 branch.

Discussion
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Fix usage of setUp in tests (3.4)

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| License       | MIT

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Commits
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298782841c fixed usage of setUp in tests

src/Symfony/Component/Lock/Tests/Store/CombinedStoreTest.php

@@ -58,7 +58,7 @@ class CombinedStoreTest extends AbstractStoreTest
     /** @var CombinedStore */
     private $store;
 
-    public function setup()
+    protected function setUp()
     {
         $this->strategy = $this->getMockBuilder(StrategyInterface::class)->getMock();
         $this->store1 = $this->getMockBuilder(StoreInterface::class)->getMock();

src/Symfony/Component/Lock/Tests/Strategy/ConsensusStrategyTest.php

@@ -22,7 +22,7 @@ class ConsensusStrategyTest extends TestCase
     /** @var ConsensusStrategy */
     private $strategy;
 
-    public function setup()
+    protected function setUp()
     {
         $this->strategy = new ConsensusStrategy();
     }

src/Symfony/Component/Lock/Tests/Strategy/UnanimousStrategyTest.php

@@ -22,7 +22,7 @@ class UnanimousStrategyTest extends TestCase
     /** @var UnanimousStrategy */
     private $strategy;
 
-    public function setup()
+    protected function setUp()
     {
         $this->strategy = new UnanimousStrategy();
     }