feat: register SignRequestCanceled activity type in info.xml

Adds the SignRequestCanceled setting and provider to the
activity section of info.xml, making it available in the
Nextcloud activity system.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

appinfo/info.xml

@@ -82,13 +82,15 @@ Developed with ❤️ by [LibreCode](https://librecode.coop). Help us transform
 		<settings>
 			<setting>OCA\Libresign\Activity\Settings\FileToSign</setting>
 			<setting>OCA\Libresign\Activity\Settings\FileSigned</setting>
+			<setting>OCA\Libresign\Activity\Settings\SignRequestCanceled</setting>
 		</settings>
 		<filters>
 			<filter>OCA\Libresign\Activity\Filter</filter>
 		</filters>
 		<providers>
 			<provider>OCA\Libresign\Activity\Provider\SignRequest</provider>
 			<provider>OCA\Libresign\Activity\Provider\Signed</provider>
+			<provider>OCA\Libresign\Activity\Provider\SignRequestCanceled</provider>
 		</providers>
 	</activity>
 	<navigations>