chore: upgrade hocon to 0.39.1

changes/ce/feat-10389.en.md

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+Now `cluster.core_nodes` and `cluster.statics.seeds` are specified in the same way.
+configure them as `["emqx1@127.0.0.1", "emqx2@127.0.0.1"]` and `"emqx1@127.0.0.1,emqx2@127.0.0.1"` has the same effect.