py(deps) libvcs 0.42.0 -> 0.43.0

[tony]

Summary

• Bump libvcs from 0.42.0 to 0.43.0 (floor: libvcs>=0.43.0,<0.44.0).
• No vcspull source or test changes — no public libvcs API changed.

libvcs 0.43.0 restores pytest 9.1 compatibility for its auto-loaded
pytest plugin. Before 0.43.0, the plugin aborted the entire test
session on pytest 9.1+ for any project with libvcs installed. vcspull
runs pytest 9.1.0, so this unblocks the test suite.

See libvcs CHANGES: https://libvcs.git-pull.com/history.html#libvcs-0-43-0-2026-06-20

Test plan

• uv run pytest passes (1087 passed)
• uv run mypy passes
• uv run ruff check . passes
• uv run ruff format . clean

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.85%. Comparing base (8f51c06) to head (9e31521).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #555      +/-   ##
==========================================
+ Coverage   82.82%   83.85%   +1.03%     
==========================================
  Files          30       30              
  Lines        4354     4354              
  Branches      873      873              
==========================================
+ Hits         3606     3651      +45     
+ Misses        502      467      -35     
+ Partials      246      236      -10     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.