Update gretty for java-configuration:saml2-login sample

Issue gh-81

servlet/java-configuration/saml2/login/build.gradle

@@ -17,7 +17,7 @@
 plugins {
 	id "java"
 	id "nebula.integtest" version "8.2.0"
-	id "org.gretty" version "3.0.6"
+	id "org.gretty" version "4.0.0"
 	id "war"
 }
 

servlet/java-configuration/saml2/login/gradle/gretty.gradle

@@ -1,5 +1,5 @@
 gretty {
-	servletContainer = "tomcat9"
+	servletContainer = "tomcat10"
 	contextPath = "/"
 	fileLogEnabled = false
 	integrationTestTask = 'integrationTest'
@@ -38,4 +38,4 @@ project.tasks.matching { it.name == "integrationTest" }.all {
 		integrationTest.systemProperty 'app.httpBaseURI', httpBaseUrl
 		integrationTest.systemProperty 'app.httpsBaseURI', httpsBaseUrl
 	}
-}
+}