Release 1.2.3

• Dependencies updates: base64 bindgen chrono env_logger flexi_logger futures
  idna inotify libc log nix num-traits openssl page_size rand rustix serde
  serde_json serde_yaml shlex signal-hook tempfile tokio url vmm-sys-util vsock
• Fix clippy errors and warnings after updates
• Added dependabot support
• Improve help text of the memory argument
• Use public containers in tests
• Update and refactor run_tests.sh