bug symfony#52978 [Webhook] [Framework] Added missing XML attribute in config XSD (TimoBakx)

This PR was merged into the 6.3 branch.

Discussion
----------

[Webhook] [Framework] Added missing XML attribute in config XSD

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

The XML schema definition was missing the type attribute for the webhook routing.

This attribute is necessary to identify the correct parser and remote event consumers.

In YAML and PHP, it exists and works:
```yaml
framework:
    webhook:
        routing:
            mailer: # <-- this identifier
                service: #...
                secret: #...
```

```php
        use App\Webhook\MailerWebhookParser;
        use Symfony\Config\FrameworkConfig;

        return static function (FrameworkConfig $frameworkConfig): void {
            $webhookConfig = $frameworkConfig->webhook();
            $webhookConfig
                ->routing('mailer') // <-- this parameter
                ->service('mailer.webhook.request_parser.mailgun')
                ->secret('%env(MAILER_MAILGUN_SECRET)%')
            ;
        };
```

#SymfonyHackday

Commits
-------

43b0877 [Webhook] Added missing XML attribute in config XSD

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/Resources/config/schema/symfony-1.0.xsd

@@ -976,6 +976,7 @@
             <xsd:element name="service" type="xsd:string" minOccurs="0" maxOccurs="1" />
             <xsd:element name="secret" type="xsd:string" minOccurs="0" maxOccurs="1" />
         </xsd:sequence>
+        <xsd:attribute name="type" type="xsd:string" use="required" />
     </xsd:complexType>
 
     <xsd:complexType name="remote-event">