Add compile-warnings-error

Closes gh-18438

Signed-off-by: Tran Ngoc Nhan <ngocnhan.tran1996@gmail.com>

Author: ngocnhan-tran1996

saml2/saml2-service-provider/spring-security-saml2-service-provider.gradle

@@ -1,3 +1,7 @@
+plugins {
+	id 'compile-warnings-error'
+}
+
 apply plugin: 'io.spring.convention.spring-module'
 
 configurations {
@@ -109,6 +113,7 @@ dependencies {
 
 	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 	testRuntimeOnly 'org.hsqldb:hsqldb'
+	opensamlFiveMain "org.apiguardian:apiguardian-api:1.1.2"
 }
 
 jar {