Update dependency coverage to v7.6.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
coverage	7.6.5 -> 7.6.7

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Release Notes

nedbat/coveragepy (coverage)

v7.6.7

Compare Source

• fix: ugh, the other assert from 7.6.5 can also be encountered in the wild,
  so it's been restored to a conditional. Sorry for the churn.

.. _changes_7-6-6:

v7.6.6

Compare Source

• One of the new asserts from 7.6.5 caused problems in real projects, as
  reported in issue 1891_. The assert has been removed.

.. _issue 1891:https://github.com/nedbat/coveragepy/issues/18911

.. _changes_7-6-5:

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