Update Rust crate serialport to v4.9.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
serialport	dependencies	minor	4.7.2 → 4.9.0

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Release Notes

serialport/serialport-rs (serialport)

v4.9.0

Compare Source

Added

• Add exclusive configuration option to SerialPortBuilder to control
  whether ports are opened with exclusive access locks.
  #​319

Changed

• Enumerate serial-base subsystem on Linux without libudev support too. Some of
  these newly enumerated ports may show up with a different type than with
  libudev, but they will be finally enumerated at all.
  #​311
• Enable arbitrary baud rates for Linux musl targets by directly using
  termios2 and the corresponding ioctls TCGETS2 and TCSETS2 from nix
  and the libc crate. There is no support form musl for termios2 and we are
  directly talking to the kernel and bypassing it here.
  #​316

Fixed

• Always propagate errors out of termios getter/setter implementations.
• Wrap slave port file descriptors in TTYPort::pair in a Drop-safe OwnedFd to avoid file descriptor leaks on early returns.
• Enable arbitrary baud rates for Linux musl targets by using the termios2
  (TCGETS2/TCSETS2 + BOTHER) path now that required libc symbols are
  available.
  #​316
• Unpin dependencies with MSRV incompatible Rust version bump. This caused
  issues with dependency resolution for many users building with newer Rust
  versions. See Dependencies on how to pin them in
  your project when building with older Rust versions.
  #​324
  #​307
  #​304
  #​300
  #​231

v4.8.1

Compare Source

Fixed

• Generating documentation on docs.rs.
  #​299

v4.8.0

Compare Source

Added

• Additionally acquire an advisory lock with flock when opening a serial port.
  #​266

Changed

• Switch from no longer actively maintained Windows FFI abstractions winapi
  to active windows-sys crate.
  #​280
• Output USB VID and PID in hexadecimal digits in UsbPortInfo's Debug
  representation.
  #​290

v4.7.3

Compare Source

Added

• Add support for opening serial ports on windows with an absolute path.
  #​259

Changed

• Revert automatically setting DTR when opening a port as the reported issues
  seem to outweigh the aimed benefit.
  #​285
  #​251
  #​243
  #​239
  #​29

Fixed

• Fix reporting serial numbers with colons on Windows.
  #​279
  #​282
• Setting arbitrary baud rates on Linux which resulted in issues when read back
  on Arch recently.
  #​281
  #​283

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