Update version to v2.9.0 (#1883)

Author: konstjar

pom.xml

@@ -6,7 +6,7 @@
   <groupId>org.ohdsi</groupId>
   <artifactId>WebAPI</artifactId>
   <packaging>war</packaging>
-  <version>2.9.0-SNAPSHOT</version>
+  <version>2.9.0</version>
   <name>WebAPI</name>
   <properties>
     <build.number>${BUILD_NUMBER}</build.number>