Hi,
this is a duplicate of a few threads like https://central.owncloud.org/t/oc-updater-curl-error-60-ssl-certificate-problem-unable-to-get-local-issuer-certificate/3746 or https://central.owncloud.org/t/unable-to-apply-update/5018 which should be easily findable when putting the following in the search function of the forums: