Release 6.3.9

gradle.properties

@@ -1,5 +1,5 @@
 springBootVersion=3.1.1
-version=6.3.9-SNAPSHOT
+version=6.3.9
 samplesBranch=6.3.x
 org.gradle.jvmargs=-Xmx3g -XX:+HeapDumpOnOutOfMemoryError
 org.gradle.parallel=true