[Gradle Release Plugin] - pre tag commit: 'v2.9.0'.

Author: ballerina-bot

gradle.properties

@@ -1,6 +1,6 @@
 org.gradle.caching=true
 group=io.ballerina.stdlib
-version=2.9.0-SNAPSHOT
+version=2.9.0
 checkstylePluginVersion=10.12.0
 spotbugsPluginVersion=5.0.14
 shadowJarPluginVersion=8.1.1