Spring ArrayIndexOutOfBoundsException with STOMP and Jetty 10

Affects: 5.3.14

Jetty10RequestUpgradeStrategy throws ArrayIndexOutOfBoundsException if STOMP (or any other WS subprotocol) is used; the offending code is the block starting at https://github.com/spring-projects/spring-framework/blob/ccf95413ed41c7016bc57f92676716fc5c44e286/spring-websocket/src/main/java/org/springframework/web/socket/server/jetty/Jetty10RequestUpgradeStrategy.java#L159 which tries to reference the third argument to an invocation that only has two (classic off-by-one error).