Update dependency pip-audit to ~=2.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pip-audit	~=2.7.3 -> ~=2.8.0

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Release Notes

pypa/pip-audit (pip-audit)

v2.8.0

Compare Source

Added

• pip-audit now allows some CLI flags to be configured via environment
  variables (#​755)

Changed

• The default cache locations on macOS and Linux now respect each platform's
  caching directory idioms (e.g. XDG)
  (#​814)

• The minimum version of Python is now 3.9
  (#​846)

Fixed

• Auditing a fully-pinned requirements file with --disable-pip now allows for
  duplicates, so long as the duplicates don't have conflicting specifier sets
  (#​749)
• Fixed two sources of unnecessary resource leaks when doing file I/O
  (#​878)

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