chore: upgrade to 3.1.0+2.4.0

compose.mariadb.yml

@@ -24,6 +24,10 @@ services:
       - MYSQL_PASSWORD_FILE=/run/secrets/db_password
       - MYSQL_USER=kuma
       - MYSQL_DATABASE=kuma
+      # Run mariadb-upgrade automatically when the data dir is from an older
+      # major version (e.g. 11.x -> 12.x). Needed because this overlay can be
+      # carried across MariaDB major bumps.
+      - MARIADB_AUTO_UPGRADE=1
     volumes:
       - mariadb:/var/lib/mysql
     networks:

release/3.1.0+2.4.0

@@ -1 +0,0 @@
-no action necessary