Updated chart dependencies for MariaDB and MongoDB

charts/ghost/Chart.lock

charts/ghost/Chart.yaml

charts/ghost/README.md

charts/ghost/RELEASENOTES.md

charts/ghost/charts/mariadb-0.2.21.tgz

charts/ghost/charts/mariadb-0.2.22.tgz

charts/gitea/Chart.lock

charts/gitea/Chart.yaml

charts/gitea/README.md

charts/gitea/RELEASENOTES.md

charts/gitea/charts/mariadb-0.2.21.tgz

charts/gitea/charts/mariadb-0.2.22.tgz

charts/graylog/Chart.lock

charts/graylog/Chart.yaml

charts/graylog/README.md

charts/graylog/RELEASENOTES.md

charts/graylog/charts/mongodb-0.3.15.tgz

charts/graylog/charts/mongodb-0.3.16.tgz

charts/nextcloud/Chart.lock

charts/nextcloud/Chart.yaml