fix(update-v8): force-add all files after cloning V8

[targos]

Add all V8 files with --force before updating DEPS. We have to do this
because some files are checked in by V8 despite .gitignore rules.

[codecov]

Codecov Report

Merging #549 (84954a5) into main (6e0a367) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #549   +/-   ##
=======================================
  Coverage   82.57%   82.57%           
=======================================
  Files          35       35           
  Lines        1750     1750           
=======================================
  Hits         1445     1445           
  Misses        305      305           

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[targos]

See nodejs/node#38990 (comment) and discussion in https://chromium-review.googlesource.com/c/v8/v8/+/2972915