⬆️ Update Rust crate serialport to v4.8.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
serialport	dependencies	minor	4.7.3 -> 4.8.1

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Release Notes

serialport/serialport-rs (serialport)

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• Switch from no longer actively maintained Windows FFI abstractions winapi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

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