Upgrade to Atomix 2.0.9
- Fix UnknownSessionExceptions
- Fix OutOfDirectMemoryErrors
- Ensure leader timeout is recurring
- Fix exceptions thrown during Raft startup communication
- Ensure sessions are only expired by leaders once

Change-Id: I856cb0840b3b609f5a3481567a4c367c8e6c9aae
diff --git a/lib/deps.json b/lib/deps.json
index f77cc66..9ad66f5 100644
--- a/lib/deps.json
+++ b/lib/deps.json
@@ -112,7 +112,7 @@
     "aopalliance-repackaged": "mvn:org.glassfish.hk2.external:aopalliance-repackaged:2.5.0-b32",
     "amqp-client": "mvn:com.rabbitmq:amqp-client:jar:3.6.1",
     "asm": "mvn:org.ow2.asm:asm:5.0.4",
-    "atomix": "mvn:io.atomix:atomix:2.0.8",
+    "atomix": "mvn:io.atomix:atomix:2.0.9",
     "commons-codec": "mvn:commons-codec:commons-codec:1.10",
     "commons-collections": "mvn:commons-collections:commons-collections:3.2.2",
     "commons-configuration": "mvn:commons-configuration:commons-configuration:1.10",