Update phpunit/phpunit requirement from ^7.1 to ^7.1 || ^8.0

[dependabot[bot]]

Updates the requirements on phpunit/phpunit to permit the latest version.

Changelog

Sourced from phpunit/phpunit's changelog.

[8.5.8] - 2020-06-22

Fixed

• #4312: Fix for #4299 breaks backward compatibility

[8.5.7] - 2020-06-21

Fixed

• #4299: "No tests executed" does not always result in exit code 1
• #4306: Exceptions during code coverage driver initialization are not handled correctly

[8.5.6] - 2020-06-15

Fixed

• #4211: phpdbg_*() functions are scoped to PHPUnit\phpdbg_*()

[8.5.5] - 2020-05-22

Fixed

• #4033: Unexpected behaviour when $GLOBALS is deleted

[8.5.4] - 2020-04-23

Changed

• Changed how PHPUnit\TextUI\Command passes warnings to PHPUnit\TextUI\TestRunner

[8.5.3] - 2020-03-31

Fixed

• #4017: Do not suggest refactoring to something that is also deprecated
• #4133: expectExceptionMessageRegExp() has been removed in PHPUnit 9 without a deprecation warning being given in PHPUnit 8
• #4139: Cannot double interfaces that declare a constructor with PHP 8
• #4144: Empty objects are converted to empty arrays in JSON comparison failure diff

[8.5.2] - 2020-01-08

Removed

• eval-stdin.php has been removed, it was not used anymore since PHPUnit 7.2.7

[8.5.1] - 2019-12-25

Changed

Commits

• 34c18ba Closes #4312
• 809b4bf Prepare release
• fa13e61 Update Psalm baseline
• 56f8e8e Simplify
• 3a600ed Mark TestCase::$backupGlobals as nullable
• 1c95329 Closes #4306
• a4baf33 Update tools
• 8eaf853 Remove test which a) does not seem to work on GitHub Actions (but does locall...
• 0ae8690 Closes #4299
• 7258f8f Only print resource usage information when tests were run
• Additional commits viewable in compare view

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[cxj]

Note to self: examine and sort out Travid build failures.