[$] Some 5.19 development statistics

The 5.19 kernel was released,after a one-week delay to deal with the fallout from the Retbleedmitigations, on July 31. By that time, 16,399 commits (15,134non-merge and 1,265 merges) had found their way into the mainlinerepository, making this development cycle the busiest since 5.13 (16,030non-merge changesets and 1,157 merges). Tradition dictates that now is the time for a lookat where the changes in 5.19 came from, and we've learned not to go againsttradition.