Support searches for non-public repeatable annotations

Prior to this commit, searches for non-public repeatable annotations
failed with error messages similar to the following, since the
repeatable annotation's container's `value()` method could not be
invoked via reflection.

JDK 8:

java.lang.IllegalAccessError: tried to access class
org.springframework.core.annotation.NestedRepeatableAnnotationsTests$A
from class com.sun.proxy.$Proxy12

JDK 17:

java.lang.IllegalAccessError: failed to access class
org.springframework.core.annotation.NestedRepeatableAnnotationsTests$A
from class jdk.proxy2.$Proxy12
(org.springframework.core.annotation.NestedRepeatableAnnotationsTests$A
is in unnamed module of loader 'app'; jdk.proxy2.$Proxy12 is in module
jdk.proxy2 of loader 'app')

This commit makes it possible to search for non-public repeatable
annotations by first attempting to invoke the repeatable annotation's
container's `value()` method via the container's InvocationHandler (if
the container is a JDK dynamic proxy) and then falling back to
reflection for the method invocation if an error occurs (such as a
SecurityException).

Closes gh-29301

spring-core/src/test/java/org/springframework/core/annotation/NestedRepeatableAnnotationsTests.java

@@ -181,7 +181,7 @@ class NestedRepeatableAnnotationsTests {
 	@Retention(RetentionPolicy.RUNTIME)
 	@Target({ ElementType.METHOD, ElementType.ANNOTATION_TYPE })
 	@Repeatable(A.Container.class)
-	public @interface A {
+	@interface A {
 
 		int value() default 0;
 
@@ -197,7 +197,7 @@ class NestedRepeatableAnnotationsTests {
 	@Repeatable(B.Container.class)
 	@A
 	@A
-	public @interface B {
+	@interface B {
 
 		@AliasFor(annotation = A.class)
 		int value();