switch to vcs2l

[tfoote]

Attempting to resolve #629

As suggested by @claraberendsen #Infrastructure General > doc_rosindex failing with setuptools 82.0.0 @ 💬

[github-actions]

Site Test Render: https://github.com/ros-infrastructure/rosindex/actions/runs/21917125096/artifacts/5470401999.

To view the resulting site:

1. Click on the above link to download the artifacts archive
2. Extract it
3. View it using your favorite local rendering tool.
   a. As one example: Run ghrocker --devel rosindex-test-render-630 Requires ghrocker installed https://github.com/tfoote/ghrocker
   b. Open http://localhost:4000 in your favorite browser

[tfoote]

I reran CI of a known good state on the default branch and validated that it failed: https://github.com/ros-infrastructure/rosindex/actions/runs/21422685640 now

Now CI is passing so I'm going to merge with a clean CI and manually retrigger.