minor #33000 Fix deprecations on 4.3 (jderusse)

This PR was merged into the 4.3 branch.

Discussion
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Fix deprecations on 4.3

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #32844
| License       | MIT
| Doc PR        | NA

Fix deprecations in branch 4.3
note: remaining deprecation `assertStringContainsString` will be fixed in #32977

* [ ] fix tests in branch 3.4 in #32981

Commits
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8fd16a6bee Fix deprecation on 4.3

Author: nicolas-grekas

Tests/Functional/ContainerDebugCommandTest.php

@@ -57,8 +57,8 @@ public function testPrivateAlias()
 
         $tester = new ApplicationTester($application);
         $tester->run(['command' => 'debug:container', '--show-hidden' => true]);
-        $this->assertNotContains('public', $tester->getDisplay());
-        $this->assertNotContains('private_alias', $tester->getDisplay());
+        $this->assertStringNotContainsString('public', $tester->getDisplay());
+        $this->assertStringNotContainsString('private_alias', $tester->getDisplay());
 
         $tester->run(['command' => 'debug:container']);
         $this->assertStringContainsString('public', $tester->getDisplay());
@@ -77,7 +77,7 @@ public function testIgnoreBackslashWhenFindingService(string $validServiceId)
 
         $tester = new ApplicationTester($application);
         $tester->run(['command' => 'debug:container', 'name' => $validServiceId]);
-        $this->assertNotContains('No services found', $tester->getDisplay());
+        $this->assertStringNotContainsString('No services found', $tester->getDisplay());
     }
 
     public function testDescribeEnvVars()