RenovateBot: Update dependency coverage to v7.6.4

This MR contains the following updates:

Package	Update	Change
coverage	patch	==7.6.3 -> ==7.6.4

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Release Notes

nedbat/coveragepy (coverage)

v7.6.4

Compare Source

• fix: multi-line with statements could cause contained branches to be incorrectly marked as missing (issue 1880_). This is now fixed.

.. _issue 1880: https://github.com/nedbat/coveragepy/issues/1880

.. _changes_7-6-3:

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