Revert "version up: MariaDB 10.4.13"

This reverts commit bb92b732 because of:

    CMake Error at storage/rocksdb/build_rocksdb.cmake:45 (MESSAGE):
      ZSTD library was not found, but WITH_ROCKSDBZSTD option is ON.  Either set
      WITH_ROCKSDBZSTD to OFF, or make sure ZSTD is installed

component/mariadb/buildout.cfg

@@ -30,8 +30,8 @@ parts =
 recipe = slapos.recipe.cmmi
 shared = true
 url = https://downloads.mariadb.org/f/mariadb-${:version}/source/mariadb-${:version}.tar.gz/from/http%3A//fr.mirror.babylon.network/mariadb/?serve
-version = 10.4.13
-md5sum = 89e832d6d89dc9bd4c98657a954e0f2c
+version = 10.4.12
+md5sum = 97d7c0f508c04a31c138fdb24e95dbc4
 location = @@LOCATION@@
 pre-configure =
   set '\bSET(PLUGIN_AUTH_PAM YES)' cmake/build_configurations/mysql_release.cmake