ekka 0.15.0 uses mria 0.5.0, which adds several fixes, enhancements and features:
- protect `mria:join/1,2` with a global lock
- implement new function `mria:sync_transaction/4,3,2`, which waits for
a transaction replication to be ready on the local node
(if the local node is a replicant)
- optimize `mria:running_nodes/0`
- optimize `mria:ro_transaction/2` when called on a replicant node.
Fixes: EMQX-9588 (#10380), EMQX-9102, EMQX-9152, EMQX-9213
Serge Tupchii