fix(files_sharing): rate limit share creation 40 times per 10 minute

lower limit of 40/600s copied from review; a compromise between:
a) rate limit not taking into account that these actions do not send emails and
b) this rate limit also serving the purpose of preventing notification/email spam

Signed-off-by: biredel <67849440+biredel@users.noreply.github.com>

Author: biredel

apps/files_sharing/lib/Controller/ShareAPIController.php

@@ -587,7 +587,7 @@ public function deleteShare(string $id): DataResponse {
 	 * 200: Share created
 	 */
 	#[NoAdminRequired]
-	#[UserRateLimit(limit: 200, period: 600)]
+	#[UserRateLimit(limit: 40, period: 600)]
 	public function createShare(
 		?string $path = null,
 		?int $permissions = null,