mariadb: remove innodb_thread_concurrency

This was deprecated in mariadb 10.5.5 and then removed 10.6. We're using MariaDB 10.11+ so no longer need this.

Author: paladox

modules/mariadb/templates/config/mw.cnf.erb

@@ -61,7 +61,6 @@ interactive_timeout            = 28800
 wait_timeout                   = 3600
 
 innodb-flush-method            = O_DIRECT
-innodb_thread_concurrency      = 0
 innodb_flush_neighbors         = 0
 innodb_io_capacity             = 500
 innodb_stats_method            = nulls_unequal