Update dependency coverage to v5.5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
coverage	==5.4 -> ==5.5

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Release Notes

nedbat/coveragepy

v5.5

Compare Source

• coverage combine has a new option, --keep to keep the original data
  files after combining them. The default is still to delete the files after
  they have been combined. This was requested in issue 1108_ and implemented
  in pull request 1110_. Thanks, Éric Larivière.

• When reporting missing branches in coverage report, branches aren't
  reported that jump to missing lines. This adds to the long-standing behavior
  of not reporting branches from missing lines. Now branches are only reported
  if both the source and destination lines are executed. Closes both issue 1065_ and issue 955_.

• Minor improvements to the HTML report:

  • The state of the line visibility selector buttons is saved in local storage
    so you don't have to fiddle with them so often, fixing issue 1123_.

  • It has a little more room for line numbers so that 4-digit numbers work
    well, fixing issue 1124_.

• Improved the error message when combining line and branch data, so that users
  will be more likely to understand what's happening, closing issue 803_.

.. _issue 803: nedbat/coveragepy#803
.. _issue 955: nedbat/coveragepy#955
.. _issue 1065: nedbat/coveragepy#1065
.. _issue 1108: nedbat/coveragepy#1108
.. _pull request 1110: nedbat/coveragepy#1110
.. _issue 1123: nedbat/coveragepy#1123
.. _issue 1124: nedbat/coveragepy#1124

.. _changes_54:

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