Ensure all files end with a new line

Update all files to ensure that they always end with a new-line
character.

Issue gh-8945

test/src/main/java/org/springframework/security/test/context/support/WithAnonymousUserSecurityContextFactory.java

@@ -43,4 +43,4 @@ final class WithAnonymousUserSecurityContextFactory implements WithSecurityConte
 		return context;
 	}
 
-}
+}

test/src/main/java/org/springframework/security/test/context/support/WithSecurityContextFactory.java

@@ -41,4 +41,4 @@ public interface WithSecurityContextFactory<A extends Annotation> {
 	 */
 	SecurityContext createSecurityContext(A annotation);
 
-}
+}