Update chart dependencies with MariaDB chart 0.2.13 (#515)

charts/ghost/Chart.lock

charts/ghost/Chart.yaml

charts/ghost/README.md

charts/ghost/charts/mariadb-0.2.12.tgz

charts/ghost/charts/mariadb-0.2.13.tgz

charts/gitea/Chart.lock

charts/gitea/Chart.yaml

charts/gitea/README.md

charts/gitea/charts/mariadb-0.2.12.tgz

charts/gitea/charts/mariadb-0.2.13.tgz

charts/nextcloud/Chart.lock

charts/nextcloud/Chart.yaml

charts/nextcloud/README.md

charts/nextcloud/charts/mariadb-0.2.12.tgz

charts/nextcloud/charts/mariadb-0.2.13.tgz

charts/wordpress/Chart.lock

charts/wordpress/Chart.yaml

charts/wordpress/README.md

charts/wordpress/charts/mariadb-0.2.12.tgz

charts/wordpress/charts/mariadb-0.2.13.tgz