⬆️ Update dependency coverage to v7.6.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
coverage	7.6.7 -> 7.6.8

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Release Notes

nedbat/coveragepy (coverage)

v7.6.8

Compare Source

• Fix: the LCOV report code assumed that a branch line that took no branches
  meant that the entire line was unexecuted. This isn't true in a few cases:
  the line might always raise an exception, or might have been optimized away.
  Fixes issue 1896_.

• Fix: similarly, the HTML report will now explain that a line that jumps to
  none of its expected destinations must have always raised an exception.
  Previously, it would say something nonsensical like, "line 4 didn't jump to
  line 5 because line 4 was never true, and it didn't jump to line 7 because
  line 4 was always true." This was also shown in issue 1896_.

.. _issue 1896:https://github.com/nedbat/coveragepy/issues/18966

.. _changes_7-6-7:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.61%. Comparing base (c5e8df5) to head (1cdb72f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #823   +/-   ##
=======================================
  Coverage   98.61%   98.61%           
=======================================
  Files           4        4           
  Lines         144      144           
  Branches        9        9           
=======================================
  Hits          142      142           
  Misses          1        1           
  Partials        1        1           

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