minor symfony#53822 [Validator] revert accepting any scalar value (xabbuh)

This PR was merged into the 7.1 branch.

Discussion
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[Validator] revert accepting any scalar value

| Q             | A
| ------------- | ---
| Branch?       | 7.1
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

This change sneaked into the codebase in symfony#52658.

Commits
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8d27007 revert accepting any scalar value

Author: nicolas-grekas

src/Symfony/Component/Validator/Constraints/CidrValidator.php

@@ -35,7 +35,7 @@ public function validate($value, Constraint $constraint): void
             return;
         }
 
-        if (!\is_scalar($value) && !$value instanceof \Stringable) {
+        if (!\is_string($value) && !$value instanceof \Stringable) {
             throw new UnexpectedValueException($value, 'string');
         }
 

src/Symfony/Component/Validator/Tests/Constraints/CidrValidatorTest.php

@@ -52,7 +52,7 @@ public function testExpectsStringCompatibleType()
     {
         $this->expectException(UnexpectedValueException::class);
 
-        $this->validator->validate([123456], new Cidr());
+        $this->validator->validate(123456, new Cidr());
     }
 
     /**