Update dependency parallel_tests to '~> 4.7', '>= 4.7.1'

This MR contains the following updates:

Package	Update	Change
parallel_tests	minor	'~> 4.4' -> '~> 4.7', '>= 4.7.1'

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

grosser/parallel_tests (parallel_tests)

v4.7.1

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Added

• Restored the --verbose-process-command and --verbose-rerun-command options, removed in version 4.0.0. See #​952. --verbose-command continues to be supported and is equivalent to set the 2 options above.

v4.7.0

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Added

• Added --failure-exit-code [INT] flag to specify a custom exit code when tests fail. This option allows users to define a specific exit code that the test suite should return if any tests fail.

v4.6.1

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Fixed

• The --allow-duplicates flag now runs duplicate tests in different groups

v4.6.0

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v4.5.2

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Fixed

• do not crash when a pid file was already deleted when trying to delete it

v4.5.1

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Fixed

Rails 5.2 and gherkin fixes

v4.5.0

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Added

• Support for running tasks against individual databases in a multi-database setup with Rails >= 6.1 (#​930)

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