chore: bump git-internal to 0.8.2

[Ivanbeethoven]

Summary

• Bump Libra's git-internal dependency requirement from 0.8.1 to 0.8.2.
• This is the release dependency follow-up for the WSL/v9fs index timestamp fix in git-internal.

Notes

• Cargo.lock is intentionally not updated yet because git-internal 0.8.2 is not available in the configured registry/mirror at PR creation time.
• After git-internal 0.8.2 is published, run cargo update -p git-internal --precise 0.8.2 and the normal Libra checks.

Validation

• Attempted cargo update -p git-internal --precise 0.8.2; it currently fails because the version has not been published to the configured registry/mirror yet.
• The WSL/v9fs behavior was validated with the sibling local checkout before this release follow-up: libra add tracked.txt succeeds on /mnt/d/code/rustpan, where stat reports Birth: -.

Link: #425

[Copilot]

Pull request overview

This PR updates Libra’s Rust dependency on git-internal to pick up the upstream WSL/v9fs index timestamp fix.

Changes:

• Bump git-internal dependency requirement from 0.8.1 to 0.8.2 in Cargo.toml.