Update dependency coverage to ^7.6.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
coverage	^7.6.7 -> ^7.6.8

---

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:

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.20%. Comparing base (596d653) to head (e62b506).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2673   +/-   ##
=======================================
  Coverage   90.20%   90.20%           
=======================================
  Files         256      256           
  Lines       15691    15691           
=======================================
  Hits        14154    14154           
  Misses       1537     1537           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.