Revise custom @⁠BootstrapWith use case in test

See https://github.com/spring-projects/spring-boot/issues/15077
See gh-35938

spring-test/src/test/java/org/springframework/test/context/BootstrapUtilsTests.java

@@ -217,8 +217,8 @@ class BootstrapUtilsTests {
 	@Retention(RetentionPolicy.RUNTIME)
 	@interface BootWithConfigurableBootstrapperInsteadOfFoo {
 
-		@AliasFor(annotation = BootstrapWith.class)
+		@AliasFor(annotation = BootstrapWith.class, attribute = "value")
-		Class<? extends TestContextBootstrapper> value() default BarBootstrapper.class;
+		Class<? extends TestContextBootstrapper> bootstrapWith() default BarBootstrapper.class;
 	}
 
 	// Invalid
@@ -255,7 +255,7 @@ class BootstrapUtilsTests {
 	@BootWithConfigurableBootstrapperInsteadOfFoo
 	static class ConfigurableAndMetaMetaBootstrapWithAnnotationsClass {}
 
-	@BootWithConfigurableBootstrapperInsteadOfFoo(EnigmaBootstrapper.class)
+	@BootWithConfigurableBootstrapperInsteadOfFoo(bootstrapWith = EnigmaBootstrapper.class)
 	static class CustomizedConfigurableAndMetaMetaBootstrapWithAnnotationsClass {}
 
 	@org.springframework.test.context.web.WebAppConfiguration