Upgrade spring-security 6.1.0

- Also spring-boot 6.1.0 for samples
- Fixes #177

Author: jvalkeal

gradle.properties

@@ -1,7 +1,7 @@
 version=2.0.0-SNAPSHOT
-springBootVersion=3.0.6
-springFrameworkVersion=6.0.8
-springSecurityVersion=6.0.3
+springBootVersion=3.1.0
+springFrameworkVersion=6.0.9
+springSecurityVersion=6.1.0
 junitVersion=5.9.1
 mockitoVersion=4.8.1
 assertjVersion=3.23.1