Update dependabot to commit all modified files

[ghost]

Dependabot currently does not commit files in the test/ directory after running make presubmit, example failure:

Run git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
On branch dependabot/go_modules/github.com/onsi/gomega-1.38.2
Your branch is up to date with 'origin/dependabot/go_modules/github.com/onsi/gomega-1.38.2'.
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   test/go.mod
	modified:   test/go.sum
no changes added to commit (use "git add" and/or "git commit -a")
Error: Process completed with exit code 1.

[mikestvz]

LGTM