MDEV-24414 Update and enable galera.galera_defaults

mysql-test/suite/galera/disabled.def

@@ -14,7 +14,6 @@ MW-286 : MDEV-18464 Killing thread can cause mutex deadlock if done concurrently
 MW-328A : MDEV-22666 galera.MW-328A MTR failed: "Semaphore wait has lasted > 600 seconds" and do not release port 16002
 MW-328B : MDEV-22666 galera.MW-328A MTR failed: "Semaphore wait has lasted > 600 seconds" and do not release port 16002
 MW-329 : MDEV-19962 Galera test failure on MW-329
-galera.galera_defaults : MDEV-21494 Galera test sporadic failure on galera.galera_defaults
 galera_as_slave_replication_bundle : MDEV-15785 OPTION_GTID_BEGIN is set in Gtid_log_event::do_apply_event()
 galera_binlog_stmt_autoinc : MDEV-19959 Galera test failure on galera_binlog_stmt_autoinc	
 galera_gcache_recover_manytrx : MDEV-18834 Galera test failure

mysql-test/suite/galera/t/galera_defaults.test

@@ -13,7 +13,7 @@
 
 # Make sure that the test is operating on the right version of galera library.
 --disable_query_log
---let $galera_version=25.3.20
+--let $galera_version=25.3.31
 source ../wsrep/include/check_galera_version.inc;
 --enable_query_log