chore: replace USB Serial library with version from pub.dev

[marcnause]

Fixes: #2962

Requires testing with phone and PSLab device.

Summary by Sourcery

Build:

• Switch usb_serial dependency from Git master to version ^0.5.0 on pub.dev

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR replaces the usb_serial dependency sourced from a GitHub repository with the published ^0.5.0 version on pub.dev, updating both pubspec.yaml and the lock file accordingly.

File-Level Changes

Change	Details	Files
Switch usb_serial dependency from GitHub to pub.dev version	Removed git URL and ref block for usb_serial Added usb_serial: ^0.5.0 under dependencies Regenerated pubspec.lock to capture the new version	pubspec.yaml pubspec.lock

Possibly linked issues

• usb_serial is pulled from git instead of pub.dev #2962: The PR replaces the usb_serial git dependency with the pub.dev version, as requested in the issue.

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[github-actions]

Build Status

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/18446588839/artifacts/4248784139.

Screenshots

Android Screenshots

iPhone Screenshots

iPad Screenshots

[marcnause]

I have tested the APK with my phone and the PSLab v6 board. As far as I can tell, communication worked without problems.

[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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