Add AnnotationClassOrMethodPointcut.hashCode() impl

Due to the absence of a `hashCode()` implementation, proxies for the `AnnotationClassOrMethodPointcut` class are regenerated each time, 
which causes them to be stored in the `org.springframework.cglib.core.internal.LoadingCache` (with `RetryConfiguration.AnnotationClassOrMethodPointcut` being part of the composite key for this object).
This results in an excessive accumulation of generated proxies in memory, ultimately leading to metaspace overflow.

Author: NorsaG

Diff for: src/main/java/org/springframework/retry/annotation/RetryConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2023 the original author or authors.
+ * Copyright 2006-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -68,6 +69,7 @@
  * @author Markus Heiden
  * @author Gary Russell
  * @author Yanming Zhou
+ * @author Evgeny Lazarev
  * @since 1.1
  *
  */
@@ -242,6 +244,11 @@ public boolean equals(Object other) {
 			return ObjectUtils.nullSafeEquals(this.methodResolver, otherAdvisor.methodResolver);
 		}
 
+		@Override
+		public int hashCode() {
+			return Objects.hash(this.methodResolver);
+		}
+
 	}
 
 	private final class AnnotationClassOrMethodFilter extends AnnotationClassFilter {