cache migrate: include dvc.lock dependencies in --dvc-files

[pmrowla]

• ❗ I have followed the Contributing to DVC checklist.

• 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

Thank you for the contribution - we'll try to review it as soon as possible. 🙏

see treeverse/dvc.org#5006

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (e18fd34) 90.60% compared to head (e9e7af5) 90.57%.

Files	Patch %	Lines
dvc/repo/commit.py	8.69%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10130      +/-   ##
==========================================
- Coverage   90.60%   90.57%   -0.04%     
==========================================
  Files         494      494              
  Lines       37639    37654      +15     
  Branches     5478     5483       +5     
==========================================
+ Hits        34104    34105       +1     
- Misses       2896     2910      +14     
  Partials      639      639              

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