minor symfony#61165 [Console] Windows Test Error - change completecar for windows for passing test (eltharin)

This PR was submitted for the 7.3 branch but it was squashed and merged into the 6.4 branch instead.

Discussion
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[Console] Windows Test Error - change completecar for windows for passing test

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| License       | MIT

add test for correct complet task caracter in windows

Commits
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997eda8 [Console] Windows Test Error - change completecar for windows for passing test

Author: nicolas-grekas

src/Symfony/Component/Console/Tests/Command/TraceableCommandTest.php

@@ -59,7 +59,8 @@ public function testRunIsNotOverriddenWithProfile()
 
     public function assertLoopOutputCorrectness(string $output)
     {
-        self::assertMatchesRegularExpression('~3/3\s+\[▓+]\s+100%~u', $output);
+        $completeChar = '\\' !== \DIRECTORY_SEPARATOR ? '▓' : '=';
+        self::assertMatchesRegularExpression('~3/3\s+\['.$completeChar.'+]\s+100%~u', $output);
         self::assertStringContainsString('Loop finished.', $output);
         self::assertEquals(3, substr_count($output, 'Hello world'));
     }