component/mariadb: use 10.4 (and drop 10.3)

We use to stick with 10.3 because of crashes with ERP5, but with 10.4.28
we don't have crashes anymore.

See https://jira.mariadb.org/browse/MDEV-23939 for the upstream bug and
nexedi/slapos!817 for a
reproduction in ERP5.

component/mariadb/buildout.cfg

@@ -26,7 +26,7 @@ extends =
 parts =
   mariadb
 
-[mariadb-10.4]
+[mariadb]
 recipe = slapos.recipe.cmmi
 shared = true
 url = https://archive.mariadb.org//mariadb-${:version}/source/mariadb-${:version}.tar.gz
@@ -131,21 +131,3 @@ environment =
   LDFLAGS=-L${groonga:location}/lib
   PKG_CONFIG_PATH=${groonga:location}/lib/pkgconfig:${groonga-normalizer-mysql:location}/lib/pkgconfig
 
-
-### XXX keep using mariadb 10.3 because 10.4 causes crash
-### (we just override here for easier revert)
-[mariadb-10.3]
-<= mariadb-10.4
-version = 10.3.38
-md5sum = 4cb91021431f514afbb1c1c2ab13944f
-post-install =
-  ldd=`ldd %(location)s/lib/plugin/ha_rocksdb.so`
-  for x in ${lz4:location} ${snappy:location} ${zstd:location}
-  do echo "$ldd" |grep -qF " $x/lib/"
-  done
-  mkdir -p %(location)s/include/wsrep &&
-  cp -p wsrep/wsrep_api.h %(location)s/include/wsrep
-
-[mariadb]
-location = ${mariadb-10.3:location}
-### /XXX keep using mariadb 10.3 because 10.4 causes crash

component/mariadb/mdev20693-mixin.cfg

 # To be extended after mariadb's buildout.cfg
 
-[mariadb-10.4]
+[mariadb]
 patches +=
   ${:_profile_base_location_}/mdev20693.patch#34ca907d6b36ba81d75bed118243f637

software/neoppod/software-mariadb-10.4.cfg

-[buildout]
-extends = software.cfg
-
-[mariadb]
-location = ${mariadb-10.4:location}

software/repman/software.cfg

@@ -32,9 +32,6 @@ parts =
   caucase-eggs
   gowork
 
-[mariadb]
-location = ${mariadb-10.4:location}
-
 [template-mysqld-wrapper]
 recipe = slapos.recipe.template
 output = ${buildout:parts-directory}/${:_buildout_section_name_}/mysqld.in

[Jérome Perrin]

Note that when loading a dump created by mariadb 10.3 in 10.4 there will be an error

ERROR 1050 (42S01) at line 19574: Table 'user' already exists

https://dba.stackexchange.com/a/285253 seems a solution, but users are probably lost in the process