Release 5.6.4

docs/antora.yml

@@ -1,3 +1,2 @@
 name: ROOT
 version: '5.6.4'
-prerelease: '-SNAPSHOT'

gradle.properties

@@ -3,7 +3,7 @@ springJavaformatVersion=0.0.31
 springBootVersion=2.4.2
 springFrameworkVersion=5.3.20
 openSamlVersion=3.4.6
-version=5.6.4-SNAPSHOT
+version=5.6.4
 kotlinVersion=1.5.32
 samplesBranch=5.6.x
 org.gradle.jvmargs=-Xmx3g -XX:MaxPermSize=2048m -XX:+HeapDumpOnOutOfMemoryError