MDEV-22967 Spider does not load in 10.5 with default settings

increase spider maturity accordingly

Author: vuvova

storage/spider/spd_param.cc

@@ -3673,7 +3673,7 @@ maria_declare_plugin(spider)
   spider_status_variables,
   spider_system_variables,
   SPIDER_DETAIL_VERSION,
-  MariaDB_PLUGIN_MATURITY_BETA
+  MariaDB_PLUGIN_MATURITY_GAMMA
 },
 spider_i_s_alloc_mem_maria,
 spider_i_s_wrapper_protocols_maria