RenovateBot: Update dependency coverage to v7.6.3

This MR contains the following updates:

Package	Update	Change
coverage	patch	==7.6.2 -> ==7.6.3

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Release Notes

nedbat/coveragepy (coverage)

v7.6.3

Compare Source

• Fix: nested context managers could incorrectly be analyzed to flag a missing branch on the last context manager, as described in issue 1876_. This is now fixed.

• Fix: the missing branch message about not exiting a module had an extra "didn't," as described in issue 1873_. This is now fixed.

.. _issue 1873: https://github.com/nedbat/coveragepy/issues/1873 .. _issue 1876: https://github.com/nedbat/coveragepy/issues/1876

.. _changes_7-6-2:

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