* upstream/main: (433 commits)
  Cleanup and format Bazel files (realm#6007)
  Remove workaround silencing SourceKitten build warning (realm#6006)
  Update dependencies (realm#6004)
  Make Danger run first
  Fix author extraction
  Silence `no_magic_numbers` rule in `#if` conditions (realm#6001)
  Add checkout step
  Use shorter name
  Add action that marks/closes stale issues
  Add new `opaque_over_existential` rule (realm#5915)
  Exclude `@Suite` types and `@Test` functions from `no_magic_numbers` analysis (realm#5968)
  Move `--only-rule` option to common arguments (realm#5981)
  Restrict permissions of remaining workflows (realm#5997)
  Restrict workflow permissions (realm#5996)
  Delete branch after merge
  Ensure that content is complete using an awaitable stream (realm#5986)
  Enable upcoming features improving concurrency checking (realm#5994)
  Fix some typos (realm#5993)
  Update contribution manual (realm#5992)
  Fix linting issues in README (realm#5991)
  ...