message: bump minimal xargo version so that it honors the lockfile
diff: @@ -6,6 +6,8 @@ use std::path::{PathBuf, Path};
  use std::process::Command;
  use std::ops::Not;
  +const XARGO_MIN_VERSION: (u32, u32, u32) = (0, 3, 17);
  +
  const CARGO_MIRI_HELP: &str = r#"Interprets bin crates and tests in Miri
  Usage:
  @@ -258,7 +260,7 @@ fn setup(ask_user: bool) {
  }
  // First, we need xargo.
  - if xargo_version().map_or(true, |v| v < (0, 3, 16)) {
  + if xargo_version().map_or(true, |v| v < XARGO_MIN_VERSION) {
  if std::env::var("XARGO").is_ok() {
  // The user manually gave us a xargo binary; don't do anything automatically.
  show_error(format!("Your xargo is too old; please upgrade to the latest version"))
  