chore: bump version to 5.0.4

apps/emqx/include/emqx_release.hrl

@@ -32,7 +32,7 @@
 %% `apps/emqx/src/bpapi/README.md'
 
 %% Community edition
--define(EMQX_RELEASE_CE, "5.0.3").
+-define(EMQX_RELEASE_CE, "5.0.4").
 
 %% Enterprise edition
 -define(EMQX_RELEASE_EE, "5.0.0-alpha.1").