Fix Spring Security version on SAML 2.0 Login Logout XML Sample

Issue gh-57

servlet/xml/java/saml2/login-logout/build.gradle

@@ -7,6 +7,7 @@ plugins {
 apply from: "gradle/gretty.gradle"
 
 repositories {
+	jcenter()
 	mavenCentral()
 	maven { url "https://repo.spring.io/snapshot" }
 	maven { url "https://build.shibboleth.net/nexus/content/repositories/releases/" }
@@ -18,16 +19,16 @@ dependencies {
 		implementation "org.opensaml:opensaml-saml-api:4.1.1"
 		implementation "org.opensaml:opensaml-saml-impl:4.1.1"
 	}
-	implementation platform("org.springframework:spring-framework-bom:5.3.13")
-	implementation platform("org.springframework.security:spring-security-bom:5.7.0-SNAPSHOT")
+	implementation platform("org.springframework:spring-framework-bom:6.0.0-SNAPSHOT")
+	implementation platform("org.springframework.security:spring-security-bom:6.0.0-SNAPSHOT")
 	implementation platform("org.junit:junit-bom:5.7.0")
 
 	implementation "org.springframework.security:spring-security-config"
 	implementation "org.springframework.security:spring-security-web"
 	implementation "org.springframework.security:spring-security-saml2-service-provider"
 	implementation "org.springframework:spring-webmvc"
-	implementation "org.thymeleaf:thymeleaf-spring5:3.0.11.RELEASE"
-	implementation 'org.thymeleaf.extras:thymeleaf-extras-springsecurity5:3.0.4.RELEASE'
+	implementation "org.thymeleaf:thymeleaf-spring6:3.1.0.M1"
+	implementation 'org.thymeleaf.extras:thymeleaf-extras-springsecurity6:3.1.0.M1'
 
 	testImplementation "org.assertj:assertj-core:3.18.0"
 	testImplementation "org.springframework:spring-test"

servlet/xml/java/saml2/login-logout/src/main/java/example/WebConfiguration.java

@@ -18,10 +18,10 @@ package example;
 
 import java.util.List;
 
-import org.thymeleaf.extras.springsecurity5.dialect.SpringSecurityDialect;
-import org.thymeleaf.spring5.SpringTemplateEngine;
-import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
-import org.thymeleaf.spring5.view.ThymeleafViewResolver;
+import org.thymeleaf.extras.springsecurity6.dialect.SpringSecurityDialect;
+import org.thymeleaf.spring6.SpringTemplateEngine;
+import org.thymeleaf.spring6.templateresolver.SpringResourceTemplateResolver;
+import org.thymeleaf.spring6.view.ThymeleafViewResolver;
 import org.thymeleaf.templatemode.TemplateMode;
 
 import org.springframework.beans.BeansException;