Remove compiler warnings for spring-security-acl

Closes gh-18415

Signed-off-by: Jay Choi <jayyoungchoi22@gmail.com>

Author: jayychoi

acl/spring-security-acl.gradle

@@ -1,4 +1,5 @@
 plugins {
+	id 'compile-warnings-error'
 	id 'javadoc-warnings-error'
 	id 'security-nullability'
 }