message: Use snapbox assertion instead of old `Project::cargo`
diff: @@ -34,7 +34,11 @@ fn simple_lib() {
  assert().subset_matches("tests/snapshots/init/simple_lib.out", project_root);
  assert!(!project_root.join(".gitignore").is_file());
  - project.cargo("build").run();
  + snapbox::cmd::Command::cargo()
  + .current_dir(project_root)
  + .arg("build")
  + .assert()
  + .success();
  assert!(!project.bin("foo").is_file());
  }
  @@ -54,7 +58,11 @@ fn simple_bin() {
  assert().subset_matches("tests/snapshots/init/simple_bin.out", project_root);
  assert!(!project_root.join(".gitignore").is_file());
  - project.cargo("build").run();
  + snapbox::cmd::Command::cargo()
  + .current_dir(project_root)
  + .arg("build")
  + .assert()
  + .success();
  assert!(project.bin("case").is_file());
  }
  @@ -77,7 +85,11 @@ fn simple_git_ignore_exists() {
  );
  assert!(project_root.join(".git").is_dir());
  - project.cargo("build").run();
  + snapbox::cmd::Command::cargo()
  + .current_dir(project_root)
  + .arg("build")
  + .assert()
  + .success();
  }
  #[cargo_test]
  