Fix test expectations for .gitignore comment created by Python 3.13+ venv

[hroncok]

Since Python 3.13, the .gitignore file is created by venv:
python/cpython#108125

Fixes #2670

Thanks for contributing, make sure you address all the checklists (for details on how see development documentation)

• ran the linter to address style issues (tox -e fix)
• wrote descriptive pull request text
• ensured there are test(s) validating the fix
• added news fragment in docs/changelog folder
• updated/extended the documentation

[hroncok]

I converted the PR to a draft to see if I could get Python 3.13 on the CI.

[gaborbernat]

I belive the CI will run with the main config because you don't have write access. However, you can enable GH actions for your fork at https://github.com/hroncok/virtualenv and we can use that.

[hroncok]

I converted the PR to a draft to see if I could get Python 3.13 on the CI.

Let's not. I'll open a separate one to see all the errors without fixes: #2673

[gaborbernat]

I belive the CI will run with the main config because you don't have write access. However, you can enable GH actions for your fork at hroncok/virtualenv and we can use that.

Until you do this I cannot validate that your changes are valid because it doesn't run your PRs CI.

[hroncok]

I can rebase this on #2673 to demonstrate the fix, but the CI will still fail due to the other issue.

[hroncok]

To avoid a chicken and egg problem, I decided to add everything at #2673