change pam and disks plugin maturity beta->gamma

plugin/auth_pam/auth_pam.c

@@ -218,6 +218,6 @@ maria_declare_plugin(pam)
   NULL,
   vars,
   "2.0",
-  MariaDB_PLUGIN_MATURITY_BETA
+  MariaDB_PLUGIN_MATURITY_GAMMA
 }
 maria_declare_plugin_end;

plugin/disks/information_schema_disks.cc

@@ -149,7 +149,7 @@ maria_declare_plugin(disks)
     NULL,                              /* no status variables */
     NULL,                              /* no system variables */
     "1.0",                             /* String version representation */
-    MariaDB_PLUGIN_MATURITY_BETA       /* Maturity (see include/mysql/plugin.h)*/
+    MariaDB_PLUGIN_MATURITY_GAMMA      /* Maturity (see include/mysql/plugin.h)*/
 }
 mysql_declare_plugin_end;