fix: add missing semicolon in isValidEmail method

Co-Authored-By: Sam Fertig <sam.fertig@codeium.com>

Author: devin-ai-integration[bot]

src/main/java/io/spring/Util.java

@@ -6,6 +6,6 @@ public static boolean isEmpty(String value) {
   }
 
   public static boolean isValidEmail(String email) {
-    return email != null && email.contains("@")
+    return email != null && email.contains("@");
   }
 }