Update API version to 2.9-SNAPSHOT in pom.xml

Change-Id: I5d542107f80600b88d844eb07d58e761b009f01e

pom.xml

diff --git a/pom.xml b/pom.xml
index 9c32190..e3fefe9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <Gerrit-ApiType>plugin</Gerrit-ApiType>
-    <Gerrit-ApiVersion>2.8-SNAPSHOT</Gerrit-ApiVersion>
+    <Gerrit-ApiVersion>2.9-SNAPSHOT</Gerrit-ApiVersion>
     <Gerrit-ReloadMode>reload</Gerrit-ReloadMode>
     <Gerrit-Module>com.googlesource.gerrit.plugins.branchnetwork.GitCommitCacheModule</Gerrit-Module>
     <Gerrit-HttpModule>com.googlesource.gerrit.plugins.branchnetwork.NetworkGraphModule</Gerrit-HttpModule>