message: Switch deny.toml to warn about duplicate crate versions instead of
  denying.
diff: @@ -144,7 +144,7 @@ registries = [
  # https://embarkstudios.github.io/cargo-deny/checks/bans/cfg.html
  [bans]
  # Lint level for when multiple versions of the same crate are detected
  -multiple-versions = "deny"
  +multiple-versions = "warn"
  # Lint level for when a crate version requirement is `*`
  wildcards = "allow"
  # The graph highlighting used when creating dotgraphs for crates
  