Update dependency coverage to v7.5.3

[mend-for-github-com]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
coverage	7.5.2 -> 7.5.3

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Release Notes

nedbat/coveragepy (coverage)

v7.5.3

Compare Source

• Performance improvements for combining data files, especially when measuring
  line coverage. A few different quadratic behaviors were eliminated. In one
  extreme case of combining 700+ data files, the time dropped from more than
  three hours to seven minutes. Thanks for Kraken Tech for funding the fix.

• Performance improvements for generating HTML reports, with a side benefit of
  reducing memory use, closing issue 1791_. Thanks to Daniel Diniz for
  helping to diagnose the problem.

.. _issue 1791:https://github.com/nedbat/coveragepy/issues/17911

.. _changes_7-5-2:

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