Add serialVersionUid

Author: jzheaux

core/src/main/java/org/springframework/security/core/SimpleAuthentication.java

@@ -16,6 +16,7 @@
 
 package org.springframework.security.core;
 
+import java.io.Serial;
 import java.util.Collection;
 import java.util.LinkedHashSet;
 import java.util.function.Consumer;
@@ -24,6 +25,9 @@
 
 final class SimpleAuthentication implements Authentication {
 
+	@Serial
+	private static final long serialVersionUID = 3194696462184782814L;
+
 	private final @Nullable Object principal;
 
 	private final @Nullable Object credentials;