server.tomcat.keep-alive-timeout is not applied to HTTP/2

Enhancement

I discovered that setting server.tomcat.keep-alive-timeout value in application.properties only set the value for the HTTP/1.1 protocol. The value for HTTP/2 remained at 20s. I needed to set the value for HTTP/2 explicitly using a customizer. I think it would be sensible for Spring Boot to expose a property that could be set.