Merge branch 'master' into ao-7831-companion

* master:
  Bump trie-db from 0.22.1 to 0.22.2 (#2208)
  runtime: add Babe::next_epoch runtime api method (#2200)
  Bump pin-project from 1.0.2 to 1.0.3 (#2209)
  Companion PR for 7822 (Remove `_{}` from benchmarks) (#2202)
  Improve the `unbacked-span` (#2206)