Allow Info to be built with null map values

See gh-48480

Signed-off-by: Tran Ngoc Nhan <ngocnhan.tran1996@gmail.com>

module/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/info/Info.java

@@ -93,7 +93,7 @@ public final class Info {
 	 */
 	public static class Builder {
 
-		private final Map<String, Object> content;
+		private final Map<String, @Nullable Object> content;
 
 		public Builder() {
 			this.content = new LinkedHashMap<>();
@@ -116,7 +116,7 @@ public final class Info {
 		 * @return this {@link Builder} instance
 		 * @see #withDetail(String, Object)
 		 */
-		public Builder withDetails(Map<String, @Nullable ? extends Object> details) {
+		public Builder withDetails(Map<String, @Nullable Object> details) {
 			this.content.putAll(details);
 			return this;
 		}

module/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/info/MapInfoContributor.java

@@ -19,6 +19,8 @@ package org.springframework.boot.actuate.info;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
+import org.jspecify.annotations.Nullable;
+
 /**
  * A simple {@link InfoContributor} that exposes a map.
  *
@@ -27,7 +29,7 @@ import java.util.Map;
  */
 public class MapInfoContributor implements InfoContributor {
 
-	private final Map<String, Object> info;
+	private final Map<String, @Nullable Object> info;
 
 	public MapInfoContributor(Map<String, Object> info) {
 		this.info = new LinkedHashMap<>(info);