Update lib/public/TextProcessing/IProviderWithUserId.php

Co-authored-by: Julien Veyssier <julien-nc@posteo.net>
Signed-off-by: Marcel Klehr <mklehr@gmx.net>

lib/public/TextProcessing/IProviderWithUserId.php

@@ -37,5 +37,5 @@ interface IProviderWithUserId extends IProvider {
 	 * @param ?string $userId the current user's id
 	 * @since 28.0.0
 	 */
-	public function setUserId(?string $userId): string;
+	public function setUserId(?string $userId): void;
 }