Update phpunit/phpunit requirement from ~5.0 to ~5.0 || ~9.0

[dependabot-preview]

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

Changelog

Sourced from phpunit/phpunit's changelog.

[9.1.5] - 2020-05-22

Fixed

• #4033: Unexpected behaviour when $GLOBALS is deleted
• #4232: StandardTestSuiteLoader produces warning and does not run any tests if the test class name is partially similar to the parent test case name

[9.1.4] - 2020-04-30

Fixed

• #4196: Invalid @covers annotation crashes test runner

[9.1.3] - 2020-04-23

Added

• #4186: Support adding directories to blacklist (of files that PHPUnit filters from stacktraces)

Changed

• PHPUnit\Util\Blacklist is no longer @internal

[9.1.2] - 2020-04-20

Changed

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

[9.1.1] - 2020-04-03

Fixed

• #4162: Raising an exception from a test double's configured method does not work

[9.1.0] - 2020-04-03

Added

• #4061: Implement assertIsNotReadable() as alternative for assertNotIsReadable() with a more readable name
• #4064: Implement assertIsNotWritable() as alternative for assertNotIsWritable() with a more readable name
• #4067: Implement assertDirectoryDoesNotExist() as alternative for assertDirectoryNotExists() with a more readable name
• #4070: Implement assertDirectoryIsNotReadable() as alternative for assertDirectoryNotIsReadable() with a more readable name
• #4073: Implement assertDirectoryIsNotWritable() as alternative for assertDirectoryNotIsWritable() with a more readable name
• #4076: Implement assertFileDoesNotExist() as alternative for assertFileNotExists() with a more readable name
• #4079: Implement assertFileIsNotReadable() as alternative for assertFileNotIsReadable() with a more readable name
• #4082: Implement assertFileIsNotWritable() as alternative for assertFileNotIsWritable() with a more readable name
• #4085: Implement assertMatchesRegularExpression() as alternative for assertRegExp() with a more readable name
• #4088: Implement assertDoesNotMatchRegularExpression() as alternative for assertNotRegExp() with a more readable name
• #4100: Implement failOnIncomplete and failOnSkipped configuration options as well as --fail-on-incomplete and --fail-on-skipped commandline options

... (truncated)

Commits

• 1b570cd Prepare release
• 71c8a27 Merge branch '8.5' into 9.1
• 63dda3b Prepare release
• 454e11b Fix
• d3dc303 Merge branch '8.5' into 9.1
• 6062679 Fix
• 15bace6 Fix CS/WS issues
• c5de29c Update ChangeLog
• d47bbbb Merge branch '8.5' into 9.1
• b810c55 Fix
• Additional commits viewable in compare view

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