Fix ListableBeanFactory#findAnnotationOnBean extension return type

Closes gh-26908

spring-beans/src/main/kotlin/org/springframework/beans/factory/ListableBeanFactoryExtensions.kt

@@ -64,6 +64,6 @@ inline fun <reified T : Annotation> ListableBeanFactory.getBeansWithAnnotation()
  * @author Sebastien Deleuze
  * @since 5.0
  */
-inline fun <reified T : Annotation> ListableBeanFactory.findAnnotationOnBean(beanName:String): Annotation? =
+inline fun <reified T : Annotation> ListableBeanFactory.findAnnotationOnBean(beanName:String): T? =
 		findAnnotationOnBean(beanName, T::class.java)
 

spring-beans/src/test/kotlin/org/springframework/beans/factory/ListableBeanFactoryExtensionsTests.kt

@@ -16,9 +16,11 @@
 
 package org.springframework.beans.factory
 
+import io.mockk.every
 import io.mockk.mockk
 import io.mockk.verify
 import org.junit.jupiter.api.Test
+import kotlin.reflect.full.createInstance
 
 /**
  * Mock object based tests for ListableBeanFactory Kotlin extensions
@@ -77,10 +79,12 @@ class ListableBeanFactoryExtensionsTests {
 		verify { lbf.getBeansWithAnnotation(Bar::class.java) }
 	}
 
+	@Suppress("UNUSED_VARIABLE")
 	@Test
 	fun `findAnnotationOnBean with String and reified type parameters`() {
 		val name = "bar"
-		lbf.findAnnotationOnBean<Bar>(name)
+		every { lbf.findAnnotationOnBean(name, Bar::class.java) } returns Bar::class.createInstance()
+		val annotation: Bar? = lbf.findAnnotationOnBean(name)
 		verify { lbf.findAnnotationOnBean(name, Bar::class.java) }
 	}