chore: Remove pytest-rerunfailures version pin

[Copilot]

This PR reverts the version restriction added in #2072 that pinned pytest-rerunfailures<16.

Background

PR #2072 temporarily restricted pytest-rerunfailures to versions below 16 due to issues with version 16.0.0, which was related to pytest-dev/pytest-rerunfailures#302.

Resolution

The underlying issue has been fixed and published in pytest-rerunfailures version 16.0.1. According to testing:

• ✅ Version 16.0.1 works correctly
• ❌ Only version 16.0.0 was problematic

With the fix now available, the version pin is no longer necessary and can be safely removed.

Changes

• Removed the <16 version constraint from pytest-rerunfailures in pyproject.toml
• The package will now use the latest available version (16.0.1+)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>chore: Remove pytest-rerunfailures version pin</issue_title>
<issue_description>Should revert #2072

Needs a published fix for pytest-dev/pytest-rerunfailures#302</issue_description>

Comments on the Issue (you are @copilot in this section)

@karangattu `pytest-rerunfailures` version `16.0.1` works. `pytest-rerunfailures` version `16.0.0` is the only failing version.

Fixes #2073

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.