Bumps pytest-rerunfailures from 16.0.1 to 16.4.

Sourced from pytest-rerunfailures's changelog.

16.4 (2026-07-01)

Breaking changes ++++++++++++++++

• Drop support for pytest 8.1. Minimum pytest version is now 8.2.

Features ++++++++

• Add support for pytest 9.1.

• Rerun tests with failed subtests. This feature is only available on pytest 9.0 and later. The pytest-subtests plugin is not supported. Fixes [#315](https://github.com/pytest-dev/pytest-rerunfailures/issues/315) <https://github.com/pytest-dev/pytest-rerunfailures/issues/315>_.

• Add --reruns-delay-backoff-factor option (and the matching reruns_delay_backoff_factor marker kwarg / ini setting) to grow the rerun delay after each attempt for an exponential backoff. The delay before the n-th re-run is reruns_delay * reruns_delay_backoff_factor ** (n - 1). The default factor is 1.0, so existing behaviour (a constant delay) is unchanged.

16.3 (2026-05-22)

Features ++++++++

• Add --reruns-mode option (strict or append). With append, marker reruns and the global --reruns / reruns ini setting are summed instead of the marker taking strict priority. Default is strict so existing behaviour is unchanged. Fixes [#321](https://github.com/pytest-dev/pytest-rerunfailures/issues/321) <https://github.com/pytest-dev/pytest-rerunfailures/issues/321>_.

• Add --rerun-show-tracebacks option to display tracebacks from failed attempts that were retried, including tests that eventually passed. The rerun summary section is emitted automatically when the flag is set, so -rR is no longer required to see the tracebacks. Fixes [#156](https://github.com/pytest-dev/pytest-rerunfailures/issues/156) <https://github.com/pytest-dev/pytest-rerunfailures/issues/156>_.

16.2 (2026-05-13)

Breaking changes ++++++++++++++++

... (truncated)

• e5a86e5 Preparing release 16.4
• 4ddc213 Add --reruns-delay-backoff-factor for exponential rerun backoff (#336)
• 483fce7 Bump the actions group with 2 updates (#337)
• 9d7756f Drop support for pytest 8.1. Add support for pytest 9.1. (#335)
• f095a51 Support rerunning on subtest errors in pytest 9.0 and newer (#330)
• 89aeccc chore: drop redundant pyupgrade by Ruff UP, extend ruff config, drop setu...
• 035bc11 Back to development: 16.4
• 4b3a220 Preparing release 16.3
• d17f3be feat: add --reruns-mode option to sum marker and global reruns (#321) (#328)
• 4a00fac Add --rerun-show-tracebacks to surface retried failures (#329)
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