RenovateBot: Update dependency coverage to v7.6.12

This MR contains the following updates:

Package	Update	Change
coverage	patch	==7.6.11 -> ==7.6.12

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Release Notes

nedbat/coveragepy (coverage)

v7.6.12

Compare Source

• Fix: some aarch64 distributions were missing (issue 1927_). These are now building reliably.

.. _issue 1927: https://github.com/nedbat/coveragepy/issues/1927

.. _changes_7-6-11:

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