minor #58094 Use Stringable whenever possible (fabpot)

This PR was merged into the 7.2 branch.

Discussion
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Use Stringable whenever possible

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Issues        | n/a
| License       | MIT

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Commits
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06b49968a5 Use Stringable whenever possible

Author: fabpot

JsonResponse.php

@@ -40,7 +40,7 @@ public function __construct(mixed $data = null, int $status = 200, array $header
     {
         parent::__construct('', $status, $headers);
 
-        if ($json && !\is_string($data) && !is_numeric($data) && !\is_callable([$data, '__toString'])) {
+        if ($json && !\is_string($data) && !is_numeric($data) && !$data instanceof \Stringable) {
             throw new \TypeError(\sprintf('"%s": If $json is set to true, argument $data must be a string or object implementing __toString(), "%s" given.', __METHOD__, get_debug_type($data)));
         }