py-pip-audit: update to 2.4.1.

## [2.4.1]

### Fixed

* Fixed a breakage in hash-checking mode caused by a
  [change to the PyPI JSON API](https://discuss.python.org/t/backwards-incompatible-change-to-pypi-json-api/17154)
  ([#318](https://github.com/trailofbits/pip-audit/pull/318))

## [2.4.0]

### Added

* Output formats: `pip-audit` now supports a Markdown format
  (`--format=markdown`) which renders results as a set of Markdown tables.
  ([#312](https://github.com/trailofbits/pip-audit/pull/312))

(wiz)