Actuator Info class has inconsistent nullability annotations and cannot be build with null value

[Maks9]

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

Info class has @Nullable values:
public @Nullable Object get(String id) {
But its Builder class not:
public Builder withDetail(String key, Object value) {

Now it is impossible to build Info with nullable value argument in kotlin.
Error example: "Require Any, but found Boolean?"

Please make Info and its Builder consistent.

[Maks9]

@philwebb Thank you for fixing this. Could you also please fix the second method?
public Builder withDetails(Map<String, Object> details) {
to be
public Builder withDetails(Map<String, @Nullable Object> details) {