minor #32857 [PhpUnitBridge] Fix deprecation assertInternalType - 4.3 (jderusse)

This PR was merged into the 4.3 branch.

Discussion
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[PhpUnitBridge] Fix deprecation assertInternalType - 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

This PR fixes PhpUnit deprecation :
> assertInternalType() is deprecated and will be removed in PHPUnit 9. Refactor your test to use assertIsArray(), assertIsBool(), assertIsFloat(), assertIsInt(), assertIsNumeric(), assertIsObject(), assertIsResource(), assertIsString(), assertIsScalar(), assertIsCallable(), or assertIsIterable() instead

follow #32846 for 4.3 branch

Commits
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aa58789542 Fix assertInternalType deprecation in phpunit 9

Author: nicolas-grekas

Tests/CurrenciesTest.php

@@ -11,13 +11,16 @@
 
 namespace Symfony\Component\Intl\Tests;
 
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Intl\Currencies;
 
 /**
  * @group intl-data
  */
 class CurrenciesTest extends ResourceBundleTestCase
 {
+    use ForwardCompatTestTrait;
+
     // The below arrays document the state of the ICU data bundled with this package.
 
     private static $currencies = [
@@ -693,7 +696,7 @@ public function testGetFractionDigits($currency)
      */
     public function testGetRoundingIncrement($currency)
     {
-        $this->assertInternalType('numeric', Currencies::getRoundingIncrement($currency));
+        $this->assertIsNumeric(Currencies::getRoundingIncrement($currency));
     }
 
     public function provideCurrenciesWithNumericEquivalent()