Treat escaped newline as valid sequence

[charliermarsh]

Summary

We weren't treating the escaped newline as a valid condition to trigger the safer fix (add an extra backslash before each invalid escape sequence).

Closes #11461.

[zanieb]

Nice!

[github-actions]

ruff-ecosystem results

Linter (stable)

ℹ️ ecosystem check encountered linter errors. (no lint changes; 1 project error)

commaai/openpilot (error)

Failed to clone commaai/openpilot: fatal: active `post-checkout` hook found during `git clone`:
	/home/runner/work/ruff/ruff/checkouts/commaai:openpilot/.git/hooks/post-checkout
For security reasons, this is disallowed by default.
If this is intentional and the hook should actually be run, please
run the command again with `GIT_CLONE_PROTECTION_ACTIVE=false`
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry with 'git restore --source=HEAD :/'

Linter (preview)

✅ ecosystem check detected no linter changes.