minor #47401 Replace get_class() calls by ::class (deguif)

This PR was squashed before being merged into the 6.2 branch.

Discussion
----------

Replace get_class() calls by ::class

| Q             | A
| ------------- | ---
| Branch?       | 6.2
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

Replace `get_class()` by `::class`

Commits
-------

675601b8f7 Replace get_class() calls by ::class

JsonResponse.php

@@ -127,7 +127,7 @@ public function setData(mixed $data = []): static
         try {
             $data = json_encode($data, $this->encodingOptions);
         } catch (\Exception $e) {
-            if ('Exception' === \get_class($e) && str_starts_with($e->getMessage(), 'Failed calling ')) {
+            if ('Exception' === $e::class && str_starts_with($e->getMessage(), 'Failed calling ')) {
                 throw $e->getPrevious() ?: $e;
             }
             throw $e;

Session/Storage/NativeSessionStorage.php

@@ -240,7 +240,7 @@ public function save()
         $previousHandler = set_error_handler(function ($type, $msg, $file, $line) use (&$previousHandler) {
             if (\E_WARNING === $type && str_starts_with($msg, 'session_write_close():')) {
                 $handler = $this->saveHandler instanceof SessionHandlerProxy ? $this->saveHandler->getHandler() : $this->saveHandler;
-                $msg = sprintf('session_write_close(): Failed to write session data with "%s" handler', \get_class($handler));
+                $msg = sprintf('session_write_close(): Failed to write session data with "%s" handler', $handler::class);
             }
 
             return $previousHandler ? $previousHandler($type, $msg, $file, $line) : false;