Merge branch 'master' into ao-session-info

* master:
  Bump smallvec from 1.4.2 to 1.5.0 (#1971)
  Companion PR for substrate#7549 (#1967)
  Bump parking_lot from 0.11.0 to 0.11.1 (#1970)
  Connect to different validators on different leaves (#1966)
  patches (#1965)
  Bump dlmalloc from 0.1.4 to 0.2.1 (#1962)