minor #37831 stop using deprecated PHPUnit APIs (xabbuh)

This PR was merged into the 4.4 branch.

Discussion
----------

stop using deprecated PHPUnit APIs

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

Commits
-------

3d209c46e4 stop using deprecated PHPUnit APIs

Tests/GitignoreTest.php

@@ -23,11 +23,11 @@ public function testCases(string $patterns, array $matchingCases, array $nonMatc
         $regex = Gitignore::toRegex($patterns);
 
         foreach ($matchingCases as $matchingCase) {
-            $this->assertRegExp($regex, $matchingCase, sprintf('Failed asserting path [%s] matches gitignore patterns [%s] using regex [%s]', $matchingCase, $patterns, $regex));
+            $this->assertMatchesRegularExpression($regex, $matchingCase, sprintf('Failed asserting path [%s] matches gitignore patterns [%s] using regex [%s]', $matchingCase, $patterns, $regex));
         }
 
         foreach ($nonMatchingCases as $nonMatchingCase) {
-            $this->assertNotRegExp($regex, $nonMatchingCase, sprintf('Failed asserting path [%s] not matching gitignore patterns [%s] using regex [%s]', $nonMatchingCase, $patterns, $regex));
+            $this->assertDoesNotMatchRegularExpression($regex, $nonMatchingCase, sprintf('Failed asserting path [%s] not matching gitignore patterns [%s] using regex [%s]', $nonMatchingCase, $patterns, $regex));
         }
     }